Questionnaire or Questionaire: Which Spelling Is Correct?

Questionnaire or Questionaire: Have you ever typed “Questionaire” and wondered whether something looked wrong? You are not alone. Questionnaire is a relatively long word, and its pronunciation does not make the spelling completely obvious.

The correct spelling is Questionnaire.

Questionaire is a common misspelling.

A Questionnaire is a set of questions used to collect information, opinions, feedback, or research data from people. Major English dictionaries, including Cambridge & Oxford, list Questionnaire as the standard English word.

Quick answer:
✅ Questionnaire = correct
❌ Questionaire = incorrect

Is It Questionnaire or Questionaire?

Questionnaire is the correct spelling.

Questionaire is an incorrect spelling and is usually created by leaving out the second n.

Compare them:

Spelling	Correct?	Explanation
Questionnaire	✅ Yes	Standard English spelling
Questionaire	❌ No	Common misspelling

Correct example

Please complete the Questionnaire before the interview.

Incorrect example

Please complete the Questionaire before the interview.

The correct spelling contains two consecutive n’s:

Q-U-E-S-T-I-O-N-N-A-I-R-E

That double n is the detail many writers forget.

Why Is “Questionnaire” the Correct Spelling?

The standard English form is questionnaire, not questionaire. Oxford traces the word to the French questionnaire, from questionner, meaning “to question.”

The spelling can seem confusing because it is tempting to think of the word as:

question + aire

But the standard form is:

question + naire = questionnaire

This is why simply writing the pronunciation as you hear it can lead to the misspelling Questionaire.

The spelling pattern to remember

QUESTION + NAIRE

Not:

QUESTION + AIRE

How Do You Spell Questionnaire?

The correct spelling is:

QUESTIONNAIRE

Break it into two useful parts:

QUESTION + NAIRE

Or remember the critical middle section:

QUESTION-N-AIRE

The complete spelling is:

Q-U-E-S-T-I-O-N-N-A-I-R-E

The easiest spelling check

Look at the middle of the word.

❌ Questionaire

✅ Questionnaire

If there is only one n after question, the spelling is wrong.

What Does Questionnaire Mean?

A Questionnaire is a written or digital set of questions designed to collect information from people.

Cambridge defines it as a list of questions asked of several people to collect information, while Oxford describes it as a written list of questions answered by multiple people for information gathering.

Questionnaires are commonly used for:

• Academic research
• Market research
• Customer feedback
• Educational research
• Healthcare Assessments
• Employee feedback
• Public opinion research
• Product research
• Customer satisfaction
• Online data collection

Example

The researchers distributed a questionnaire to 500 participants.

In this example, the Questionnaire is the collection of questions used to obtain information from the participants.

Questionnaire as a Noun

Questionnaire is a countable noun.

You can use it with:

• a Questionnaire
• one Questionnaire
• several Questionnaires
• many Questionnaires
• the Questionnaire

Examples

I completed a Questionnaire.

The researcher prepared a Questionnaire for the study.

We received several Questionnaires from customers.

The participants completed the Questionnaire online.

How Do You Pronounce Questionnaire?

The word Questionnaire is commonly pronounced approximately as:

kwes-chuh-NAIR

Cambridge gives the following pronunciations:

• UK: /ˌkwes.tʃəˈneə(r)/
• US: /ˌkwes.tʃəˈner/

The final part sounds roughly like “nair.”

Simple pronunciation guide

Questionnaire → kwes-chuh-nair

The pronunciation can contribute to the spelling confusion because the spoken word does not make the two N’s visually obvious.

Questionnaire vs. Questionaire: Quick Comparison

Feature	Questionnaire	Questionaire
Correct spelling	✅ Yes	❌ No
Standard English word	✅ Yes	❌ No
Dictionary form	✅ Yes	❌ No
Suitable for formal writing	✅ Yes	❌ No
Contains double “n”	✅ Yes	❌ No
Meaning	Set of questions	—

Remember

Questionnaire = correct
Questionaire = misspelling

Why Do People Spell Questionnaire Incorrectly?

There are several reasons this word can cause problems.

1. The pronunciation is not completely transparent

When you hear Questionnaire, you may focus on the ending “-naire” rather than the spelling in the middle.

2. The word is relatively long

Long words are more likely to produce spelling errors, especially when two identical letters occur next to each other.

3. The double “N” is easy to overlook

The difference between the two forms is small visually:

Questionnaire
Questionaire

One missing N changes the spelling from correct to incorrect.

4. Its French origin makes the spelling less intuitive

English contains many words borrowed from other languages, and their spelling patterns are not always predictable from modern English pronunciation. Oxford identifies questionnaire as coming from French.

Easy Trick to Remember the Spelling

The simplest memory trick is:

QUESTION + NAIRE = QUESTIONNAIRE

Think of the word as containing the complete word QUESTION followed by NAIRE.

Another quick reminder:

A questionnaire needs two N’s.

So before submitting your writing, check:

❌ Questionaire
✅ Questionnaire

Memory formula

QUESTION + NAIRE → QUESTIONNAIRE

This is easier to remember than trying to memorize all the letters individually.

Questionnaire Examples in Sentences

Here are examples from everyday, academic, professional, and research contexts.

1. Everyday English

I completed the questionnaire before joining the program.

Explanation: The person answered a set of questions.

2. Academic English

The students completed a questionnaire about their study habits.

Explanation: The questionnaire collected information about students’ habits.

3. Research English

The researchers developed a questionnaire to collect data from participants.

Explanation: The questionnaire served as a research data-collection tool.

4. Business English

Customers received an online questionnaire after purchasing the product.

Explanation: The business used questions to obtain customer feedback.

5. Healthcare English

Please complete the health questionnaire before your appointment.

Explanation: The questionnaire collects relevant information from the patient.

6. Education

The teacher distributed a questionnaire to measure student satisfaction.

7. Marketing

The company used a questionnaire to understand consumer preferences.

8. Workplace

Employees were asked to complete an anonymous questionnaire about workplace conditions.

9. Academic research

Participants were asked to complete the questionnaire independently.

10. Online context

The questionnaire was available through the university’s website.

Questionnaire in Different Contexts

The word is especially useful in formal and information-gathering contexts.

Context	Example
Academic	Students completed a questionnaire about learning methods.
Scientific	Researchers administered a standardized questionnaire.
Business	Customers completed a satisfaction questionnaire.
Healthcare	Patients filled out a medical questionnaire.
Marketing	The company created a customer questionnaire.
Education	Teachers used a questionnaire to collect student feedback.
Workplace	Employees answered an anonymous questionnaire.
Public research	Residents received a questionnaire about local services.

What Is the Plural of Questionnaire?

The plural of Questionnaire is:

Questionnaires

You simply add -s to the singular noun.

Singular	Plural
Questionnaire	Questionnaires

Examples

The researcher distributed one Questionnaire.

The researchers collected 300 Questionnaires.

Several Questionnaires were analyzed after the study.

Common mistake

❌ Questionnaireses
❌ Questionaires
✅ Questionnaires

Questionnaire vs. Survey: Are They the Same?

Questionnaire and survey are closely related, but they are not always interchangeable.

A Questionnaire generally refers to the actual set of questions used to collect responses.

A Survey can refer more broadly to the process, study, or activity of collecting and analyzing information.

Simple distinction

Questionnaire = the questions

Survey = the broader data-collection activity

Example

The researcher created a questionnaire for the survey.

In this sentence:

• Questionnaire = the set of questions
• Survey = the broader research activity

In everyday English, however, people sometimes use survey and Questionnaire loosely as if they mean the same thing.

Questionnaire vs. Form

A Questionnaire and a form can look similar, but their purposes can differ.

A form is generally used to collect or record information, often for a particular administrative purpose.

A Questionnaire is specifically organized around questions designed to obtain information, opinions, attitudes, preferences, or responses.

Example

A registration form might ask for:

• Name
• Address
• Phone number
• Email address

A customer questionnaire might ask:

• How satisfied were you with our service?
• What did you like most?
• How could we improve?

So:

Form → information or registration

Questionnaire → structured questions and responses

When Should You Use the Word Questionnaire?

Use Questionnaire when you are referring to a structured collection of questions used to obtain information from respondents.

Academic writing

Participants completed a questionnaire before the experiment.

Scientific research

Data were collected using a standardized questionnaire.

Business

Customers were invited to complete a satisfaction questionnaire.

Healthcare

Patients completed a medical questionnaire.

Education

Students responded to a questionnaire about online learning.

Marketing

The company distributed a questionnaire to its customers.

Common Misspellings of Questionnaire

Because the word is long, several incorrect forms may appear.

Incorrect	Correct
❌ questionaire	✅ questionnaire
❌ questionnarie	✅ questionnaire
❌ questionnare	✅ questionnaire
❌ questionairee	✅ questionnaire
❌ questioneer	✅ questionnaire

The most important one to recognize is:

❌ Questionaire
✅ Questionnaire

Common Errors With Questionnaire

Error 1: Leaving out the second “n”

❌ The participants completed the Questionaire.

✅ The participants completed the Questionnaire.

Error 2: Confusing questionnaire with survey

❌ The questionnaire and survey must always mean exactly the same thing.

✅ A questionnaire is generally the question set, while a survey can describe the broader study or data-collection process.

Error 3: Misspelling the plural

❌ The researchers collected many Questionaires.

✅ The researchers collected many Questionnaires.

Error 4: Trying to spell it entirely from pronunciation

Because the pronunciation does not clearly reveal every letter, spelling it only from sound can lead to mistakes.

Questionnaire Synonyms and Related Words

Depending on the context, related terms include:

• Survey
• Survey form
• Question sheet
• Set of questions
• Form
• Research instrument
• Feedback form
• Assessment form

However, these are not always exact synonyms.

For example, a research instrument can include tools other than questionnaires, while a survey can refer to a broader research process.

Why Correct Spelling Matters

A spelling mistake does not necessarily prevent readers from understanding your meaning. However, using the standard spelling is especially important in academic, professional, and formal writing.

The word Questionnaire commonly appears in:

• Research papers
• Academic theses
• Dissertations
• Business reports
• Surveys
• Emails
• Resumes
• Websites
• Marketing materials
• Professional documents

Compare:

❌ The participants completed the questionaire.

✅ The participants completed the questionnaire.

The second sentence uses the standard English spelling.

Exam Tip: Questionnaire or Questionaire?

If you encounter this word in a spelling or error-detection question, choose:

✅ Questionnaire

Look specifically for the double n.

Quick exam rule

question + naire = Questionnaire

If the option says questionaire, it is misspelled.

Quick Revision Box

Remember These 5 Points

1. ✅ Questionnaire is correct.
2. ❌ Questionaire is incorrect.
3. Questionnaire is a noun.
4. The plural is Questionnaires.
5. Remember: QUESTION + NAIRE.

Practice: Choose the Correct Spelling

1. Choose the correct word:

A. Questionaire
B. Questionnaire
C. Questionnarie
D. Questionnare

Answer: B. Questionnaire

2. Choose the correct sentence:

A. Please complete the questionaire.
B. Please complete the questionnaire.

Answer: B. Please complete the questionnaire.

3. Fill in the blank:

The researchers distributed a __________ to the participants.

Answer: questionnaire

4. Correct the spelling:

The students completed a questionaire about online learning.

Correct sentence:

The students completed a questionnaire about online learning.

5. What is the plural of questionnaire?

A. Questionnairees
B. Questionaires
C. Questionnaires
D. Questionnaries

Answer: C. Questionnaires

People Also Ask

Final Answer: Questionnaire or Questionaire?

The correct spelling is:

✅ Questionnaire

The incorrect spelling is:

❌ Questionaire

A Questionnaire is a set of questions used to collect information, opinions, feedback, or research data.

The easiest way to remember the spelling is:

QUESTION + NAIRE = QUESTIONNAIRE

Whenever you are writing an academic paper, research report, business document, email, website, or professional document, choose Questionnaire.

Once you remember the double N, this commonly confused spelling becomes much easier to get right.