Usage Note
Questionnaire entered English directly from French and the two words are close cognates. In French it refers to any structured set of written questions — from a medical intake form to a market research survey. The related verb is questionner (to question someone). Note that un questionnaire is a written document, whereas une interview or un entretien involves spoken questions and answers.
Examples
"Veuillez remplir ce questionnaire."
Natural Translation
Please fill in this questionnaire.

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