Have you ever hesitated over the spelling of questionnaire and wondered if it should be questionnaire or questionaire? The difference in Questionnaire vs Questionaire comes down to a single letter, but that small detail matters because only one spelling is considered correct in standard English.
Questionnaire is the correct spelling, while questionaire is a common misspelling. A questionnaire is a set of questions designed to collect information, opinions, or responses from people. The correct spelling includes two n’s and two i’s: questionnaire.
Examples:
- The researcher asked participants to complete a questionnaire.
- We sent a questionnaire to customers after the survey.
The confusion is understandable. People often search for questionnaire vs questionaire, questionnaire or questionaire, which spelling is correct, or questionnaire meaning in English because the word contains several vowels that can be easy to mix up. However, questionaire is not an accepted alternative spelling of questionnaire. The correct form is questionnaire.
In this guide, you’ll learn the complete difference between Questionnaire vs Questionaire, including their meaning, pronunciation, origin, correct spelling, and usage. You’ll also discover why questionaire is commonly misspelled and see clear examples to help you remember the correct spelling.
Questionnaire or Questionaire: Which Is Correct?
The correct spelling is questionnaire.
Questionaire is not the standard English spelling of the word. It usually appears because writers accidentally leave out one of the two n’s.
| Spelling | Correct? | Explanation |
| questionnaire | ✅ Yes | Standard English spelling |
| questionaire | ❌ No | Common misspelling |
| questionnare | ❌ No | Misspells the ending |
| questionnarie | ❌ No | Incorrect vowel arrangement |
| questionnair | ❌ No | Missing the final e |
The easiest way to remember the correct form is to focus on the middle:
question + naire = questionnaire
Notice what happens at the join. The word question already ends in n, and the following part begins with another n. That gives you:
questionnaire
not:
questionaire
This small spelling detail makes a big difference in formal writing.
For example:
- Correct: Please complete the questionnaire before Friday.
- Incorrect: Please complete the questionaire before Friday.
- Correct: The researchers distributed a questionnaire to participants.
- Incorrect: The researchers distributed a questionaire to participants.
If you’re writing an email, report, application, research paper, or business document, use questionnaire.
What Does Questionnaire Mean?
A questionnaire is a set or list of questions designed to collect information from people. Merriam-Webster defines it as a set of questions used to obtain statistically useful or personal information, while Cambridge describes it as a list of questions asked so information can be collected about something.
In simple terms, a questionnaire is a structured way of asking people a series of questions and recording their answers.
For example, imagine a company wants to understand why customers are canceling a subscription. Instead of asking every customer individually, it might send a questionnaire containing questions such as:
- How satisfied are you with the service?
- How often do you use the product?
- What feature do you use most?
- What made you consider canceling?
- How likely are you to recommend the service?
The answers can then help the company identify patterns.
Questionnaires can collect different kinds of information, including:
- Opinions
- Preferences
- Experiences
- Demographic information
- Knowledge
- Behaviors
- Satisfaction levels
- Personal information
The format can also vary. A questionnaire might contain multiple-choice questions, rating scales, yes-or-no questions, short answers, or longer written responses.
Simple Definition of Questionnaire
A straightforward definition is:
A questionnaire is a structured set of questions used to collect information from people.
That definition works across most everyday contexts.
For example, a school might use a questionnaire to ask students about their learning experience. A researcher might use one to gather data for a study. A doctor might ask a patient to complete a questionnaire before an appointment.
The purpose changes, but the basic idea stays the same: questions are organized so that information can be collected consistently.
Why Is Questionnaire Often Misspelled as Questionaire?
The main spelling problem is easy to spot once you slow the word down.
The correct spelling contains:
questionnaire
The incorrect version removes one n:
questionaire
That missing letter can be hard to notice because the pronunciation doesn’t clearly emphasize every letter in the written word.
Cambridge gives the US pronunciation as /ˌkwes.tʃəˈner/ and the UK pronunciation as /ˌkwes.tʃəˈneər/. The ending therefore sounds much shorter than the full spelling might suggest.
This creates a familiar spelling trap. You hear something close to:
question-air
but you need to write:
questionnaire
The word also contains a French-derived ending, which contributes to its unusual appearance in English.
The Double-N Problem
The most useful part to remember is the nn:
question + naire
The first n belongs to question.
The second n begins naire.
Put them together and you get:
questionnaire
That gives you a practical spelling check. If you’ve written questionaire, stop and look at the middle. You’re missing the second n.
How Do You Spell Questionnaire Correctly?
The correct spelling is:
Q-U-E-S-T-I-O-N-N-A-I-R-E
There are 13 letters in questionnaire.
A useful way to break it down is:
question + naire
You don’t need to memorize all 13 letters individually. Instead, remember the word in two recognizable pieces.
Spelling Breakdown
| Part | Letters |
| question | q-u-e-s-t-i-o-n |
| naire | n-a-i-r-e |
| Complete word | q-u-e-s-t-i-o-n-n-a-i-r-e |
The important detail is that the two pieces meet at nn.
question + naire → questionnaire
That gives you a much better memory aid than trying to memorize the whole word as one long string of letters.
A Simple Memory Trick
Think:
A question becomes a questionnaire, so keep the n from question and add another n.
Or simply remember:
question + naire
If you can remember that combination, you’re much less likely to write questionaire.
Questionnaire vs Questionaire Examples
Seeing the two spellings side by side makes the difference obvious.
| Incorrect | Correct |
| Please complete the questionaire. | Please complete the questionnaire. |
| We sent a customer questionaire by email. | We sent a customer questionnaire by email. |
| The researcher created a questionaire for participants. | The researcher created a questionnaire for participants. |
| I filled out the questionaire yesterday. | I filled out the questionnaire yesterday. |
| The school gave parents a questionaire. | The school gave parents a questionnaire. |
The meaning doesn’t change because of the spelling mistake. However, the incorrect form can make your writing look careless, especially in academic or professional settings.
Consider this sentence:
The research team distributed a questionaire to 500 participants.
A reader will probably understand what you mean. Still, the spelling is wrong.
The corrected version is:
The research team distributed a questionnaire to 500 participants.
That tiny correction makes the sentence polished and standard.
How to Use Questionnaire in a Sentence
Questionnaire is a countable noun. That means you can talk about a questionnaire, one questionnaire, or several questionnaires.
Here are some natural examples:
- I completed a questionnaire about customer satisfaction.
- The researchers created a detailed questionnaire.
- Participants received the questionnaire by email.
- We collected responses from 1,000 questionnaires.
- Please complete this questionnaire before the interview.
- The company sent customers an online questionnaire.
- Each student received a short questionnaire.
The word commonly appears with verbs such as complete, fill out, fill in, answer, send, administer, distribute, and design.
For example:
The research team designed a questionnaire for college students.
Participants were asked to complete the questionnaire online.
The company sent out a questionnaire after the purchase.
Cambridge specifically lists common combinations such as fill in, fill out, and complete a questionnaire.
Questionnaire in Academic Writing
Academic researchers often use questionnaires to collect standardized information from participants.
For example, a researcher studying student satisfaction might ask participants to rate statements from 1 to 5:
| Statement | Response scale |
| The course materials were useful. | 1–5 |
| The instructor explained concepts clearly. | 1–5 |
| The assignments were relevant. | 1–5 |
| I would recommend this course. | 1–5 |
Using the same questions for many participants makes responses easier to organize and compare.
Questionnaires are especially useful when researchers need information from a relatively large group without conducting a separate interview with every person.
Questionnaire in Business
Businesses use questionnaires to understand customers, employees, and markets.
A customer questionnaire might ask:
- How satisfied are you with your purchase?
- How easy was it to use our website?
- How would you rate customer service?
- Which product feature matters most to you?
- Would you recommend our company?
Employee questionnaires can focus on workplace satisfaction, training, communication, or company culture.
Market researchers may use questionnaires to learn about buying habits, preferences, and opinions.
Questionnaire in Healthcare
Healthcare professionals may also use questionnaires to collect information from patients.
For example, a patient may complete a questionnaire about:
- Symptoms
- Medical history
- Daily activities
- Pain levels
- Lifestyle factors
- Treatment experiences
The exact content depends on the purpose of the questionnaire.
Questionnaire in Education
Schools and universities use questionnaires for many practical reasons.
A teacher might distribute one after a course to gather feedback. A school could use one to learn about students’ interests. Researchers in education may also use questionnaires as part of a formal study.
For example:
The students completed a questionnaire about their study habits.
The questionnaire itself doesn’t have to be complicated. Even a short form containing five questions qualifies as a questionnaire if it serves the purpose of systematically collecting information.
Questionnaire vs Survey: Are They the Same?
Questionnaire and survey are closely related, but they aren’t always exact synonyms.
A questionnaire is primarily the set of questions.
A survey can refer to the broader process of collecting and analyzing information.
Think of it this way:
Questionnaire → the questions
Survey → the larger information-gathering process
For example, a research project might involve:
- Designing a questionnaire.
- Sending it to participants.
- Collecting responses.
- Analyzing the responses.
- Reporting the results.
The questionnaire is one part of that larger process.
However, everyday English often uses survey and questionnaire interchangeably. Merriam-Webster even includes a survey-related sense for questionnaire.
So the distinction is useful, but it shouldn’t be treated as an absolute rule.
A Practical Comparison
| Questionnaire | Survey |
| A set of questions | A broader information-gathering activity |
| Focuses on collecting responses | Can include collecting and analyzing responses |
| Can be paper or digital | Can use questionnaires, interviews, observations, or other methods |
| Often forms part of a survey | May include a questionnaire |
For example, an online form containing 15 questions can be a questionnaire. The entire project of sending that form to customers, collecting responses, analyzing the data, and reporting the results can be called a survey.
What Is the Plural of Questionnaire?
The plural of questionnaire is questionnaires.
You simply add s to the singular form:
Singular: questionnaire
Plural: questionnaires
Here are some examples:
- The researcher distributed 500 questionnaires.
- We received completed questionnaires from most participants.
- The company compared the responses from three different questionnaires.
- Several questionnaires were returned without answers.
Don’t change the ending to questionnairs. The final e remains before the plural s:
questionnaire → questionnaires
This follows the normal plural pattern for many nouns ending in silent e.
Is Questionnaire a Noun?
Yes. Questionnaire is a noun.
More specifically, it is a countable noun. Cambridge labels it as a noun and marks it with [C], indicating that it can be counted.
That means these forms work naturally:
- a questionnaire
- one questionnaire
- two questionnaires
- many questionnaires
- several questionnaires
- the questionnaire
- this questionnaire
For example:
I completed a questionnaire.
The researchers reviewed several questionnaires.
You generally wouldn’t say:
I completed questionnaire.
Instead, use an article or another determiner when you’re referring to a singular countable questionnaire:
I completed the questionnaire.
I completed a questionnaire.
How Do You Pronounce Questionnaire?
In US English, questionnaire is pronounced:
/ˌkwes.tʃəˈner/
Cambridge gives this US pronunciation and places the main stress on the final syllable.
A rough learner-friendly approximation is:
kwes-chuh-NAIR
The final sound resembles nair, as in millionaire, although the entire word should be pronounced naturally rather than as a strict letter-by-letter sequence.
The UK pronunciation differs slightly:
/ˌkwes.tʃəˈneər/
The important point for spelling is that pronunciation doesn’t give you a reliable letter-for-letter guide. You can clearly hear the main parts of the word, but the written form contains details that aren’t obvious from the sound alone.
Why Pronunciation Can Cause Spelling Problems
When you say questionnaire, the two n’s don’t sound like two separate, strongly pronounced consonants.
That’s why someone might hear the word and write:
questionaire
instead of:
questionnaire
This is a good example of why English spelling sometimes requires memory rather than pure phonetic logic.
Questionnaire Word Origin
The unusual spelling makes more sense when you look at the word’s history.
Merriam-Webster traces questionnaire to French questionnaire, which comes from questionner, meaning to question. The English word’s first known use dates to 1890.
The related word question has a much older history. Merriam-Webster traces question through Middle English and Anglo-French to Latin quaestio, connected with quaerere, meaning to seek or ask.
So the relationship between question and questionnaire isn’t accidental.
The spelling reflects the word’s history:
question → questionnaire
That historical connection also helps explain why the word doesn’t follow the simplest English spelling patterns.
Common Mistakes With Questionnaire
Questionaire is the mistake you’re most likely to encounter, but it isn’t the only possible misspelling.
Here are several incorrect forms to watch for:
| Incorrect form | Correct form |
| questionaire | questionnaire |
| questionnare | questionnaire |
| questionnarie | questionnaire |
| questionnair | questionnaire |
| questionair | questionnaire |
The most important one to remember is questionaire because it looks almost identical to the correct spelling.
Mistake: Dropping the Second N
Wrong: questionaire
Right: questionnaire
This happens when writers mentally divide the word as:
question + aire
But the correct structure is closer to:
question + naire
Remembering that second n solves the problem.
Mistake: Changing the Ending
Another common problem is writing an ending such as -nare or -narie.
The correct ending is:
-naire
So the complete word is:
questionnaire
not questionnare or questionnarie.
Quick Way to Remember the Spelling
If you only remember one thing from this article, remember this:
question + naire = questionnaire
The double n is the key.
You can also picture the word in two chunks:
QUESTION | NAIRE
Now join them:
QUESTIONNAIRE
That mental split makes the spelling easier to reproduce without staring at the word repeatedly.
Another useful trick is to connect the word to its purpose. A questionnaire contains questions. The word begins with question, so keep that complete spelling before adding naire.
The One-Look Spelling Check
Before submitting a document, look specifically at the middle of the word.
Is it:
questionnaire ✅
or:
questionaire ❌
If there is only one n between the o and a, you’ve missed a letter.
Questionnaire in American and British English
Unlike pairs such as color/colour or organize/organise, questionnaire does not have a standard American-versus-British spelling difference.
The spelling remains:
questionnaire
in both varieties of English.
The pronunciation can differ slightly. Cambridge lists /ˌkwes.tʃəˈner/ for US English and /ˌkwes.tʃəˈneər/ for UK English.
The word is therefore not an example of an American spelling versus a British spelling.
| Variety | Spelling | Pronunciation |
| American English | questionnaire | /ˌkwes.tʃəˈner/ |
| British English | questionnaire | /ˌkwes.tʃəˈneər/ |
So if you’re writing for an American audience, use questionnaire. If you’re writing for a British audience, use questionnaire as well.
Questionnaire vs Questionaire in Formal Writing
Spelling becomes especially important in formal contexts.
Imagine submitting a research proposal containing the sentence:
The participants will complete a questionaire before the interview.
The meaning is still clear. Yet the spelling error can distract the reader and weaken the professionalism of the document.
The corrected version is:
The participants will complete a questionnaire before the interview.
You should use the correct spelling in:
- Academic papers
- Research reports
- Business proposals
- Customer communications
- Resumes and applications
- Professional emails
- Surveys and forms
- Presentations
- Website copy
- Educational materials
A single spelling error rarely destroys a piece of writing. Still, avoiding obvious mistakes is one of the easiest ways to make your writing look polished.
A Practical Example: Using Questionnaire Correctly
Consider a university that wants to understand how students use its library.
The research team creates a questionnaire containing 12 questions. Some ask about visit frequency. Others ask about opening hours, available resources, study spaces, and digital services.
Students receive the questionnaire online.
The research process might look like this:
Research goal
↓
Create questionnaire
↓
Distribute questionnaire
↓
Collect responses
↓
Analyze responses
↓
Report findings
Here, the questionnaire is the actual collection of questions. The entire activity is a broader research or survey process.
This distinction matters because it shows how the word works in real contexts rather than as an isolated dictionary definition.
Examples of Questionnaire in Everyday Sentences
Here are additional examples showing how naturally the word fits into different contexts.
Research
The researchers developed a questionnaire to measure participants’ attitudes toward remote work.
Each participant received the same questionnaire.
Business
Customers received a short questionnaire after completing their purchases.
The company used a questionnaire to gather feedback on its new service.
Education
Students completed a questionnaire at the end of the semester.
The teacher distributed a questionnaire about classroom activities.
Healthcare
The patient completed a health questionnaire before the appointment.
The clinic asked new patients to fill out a questionnaire online.
Employment
Applicants were asked to complete a questionnaire before the interview.
The company used an employee questionnaire to collect workplace feedback.
Events
Guests received a questionnaire asking about their experience at the event.
Online Services
Please complete the questionnaire to help us improve the website.
These examples show that questionnaire isn’t limited to academic research. It works across many everyday and professional situations.
Questionnaire Synonyms and Related Words
Several words are related to questionnaire, but they don’t always mean exactly the same thing.
Merriam-Webster’s thesaurus lists related terms such as survey, poll, inquiry, investigation, study, and questionary.
| Word | General meaning |
| Questionnaire | A structured set of questions |
| Survey | An information-gathering activity or set of questions |
| Poll | A way of measuring opinions or preferences, often through a limited set of questions |
| Inquiry | A request for information or a formal investigation |
| Interview | A conversation in which questions are asked and answered |
| Quiz | A set of questions used mainly to test knowledge |
These words overlap, but choosing the most precise term can make your writing clearer.
For example, a five-question vote about which product people prefer might be called a poll. A 30-question research instrument designed to gather detailed participant information is more naturally called a questionnaire.
Questionnaire or Questionaire: Quick Answer
Questionnaire is the correct spelling.
Questionaire is a misspelling.
A questionnaire is a structured set of questions used to collect information, opinions, experiences, or other responses from people. It can be used in research, education, healthcare, business, customer feedback, and many other settings.
The easiest spelling trick is:
question + naire = questionnaire
Pay particular attention to the double n.
If you’re unsure, don’t write questionaire. Write questionnaire.
Frequently Asked Questions About Questionnaire or Questionaire
Is it questionnaire or questionaire?
Questionnaire is correct. Questionaire is a misspelling. The correct word contains two consecutive n’s:
questionnaire
Is questionaire a word?
No. Questionaire is not the standard spelling of the English word. The correct spelling is questionnaire.
What does questionnaire mean?
A questionnaire is a set or list of questions used to collect information from people. It can gather opinions, experiences, personal details, preferences, or other types of data.
How do you spell questionnaire?
Spell it:
Q-U-E-S-T-I-O-N-N-A-I-R-E
A useful breakdown is:
question + naire
What is the plural of questionnaire?
The plural is questionnaires.
Example:
The researchers collected 2,000 completed questionnaires.
Is questionnaire American or British English?
Questionnaire is used in both American and British English. The spelling is the same in both varieties. The pronunciation differs slightly.
How do you pronounce questionnaire?
In US English, Cambridge gives the pronunciation /ˌkwes.tʃəˈner/. A rough learner-friendly pronunciation is kwes-chuh-NAIR.
Is questionnaire a noun?
Yes. Questionnaire is a countable noun.
You can say:
- a questionnaire
- one questionnaire
- several questionnaires
- the questionnaire
When was questionnaire first used in English?
Merriam-Webster gives 1890 as the first known use of questionnaire in English. The word comes from French questionnaire.
What is the difference between a questionnaire and a survey?
A questionnaire is the set of questions. A survey can refer to the broader process of gathering and analyzing information. In everyday English, however, the terms often overlap.
Final Answer: Questionnaire or Questionaire?
When you’re deciding between questionnaire or questionaire, choose questionnaire every time.
The correct spelling contains the double n:
questionnaire ✅
The common misspelling leaves one out:
questionaire ❌
The easiest way to remember the difference is to break the word into two parts:
question + naire
Once you spot that structure, the spelling becomes much easier.
A questionnaire is simply a structured set of questions used to collect information. The word appears in research papers, customer feedback forms, healthcare documents, schools, businesses, and everyday online forms. Its first known English use dates to 1890, and its spelling reflects its French origin.
So, the next time you type the word, don’t let the silent-looking letters trip you up.
Questionnaire is correct. Questionaire is not.
