IPA: /ˈkwɛs.tʃə.nə.ri/
KK: /ˈkwɛsʧəˌnɛri/
A set of questions designed to gather information from people.
The company sent out a questionary to collect feedback from its customers.
Questionary → It is formed from "question" (from Latin "quaestio", meaning inquiry or a seeking of information) and the suffix "-ary" (meaning relating to or connected with). The word "questionary" refers to something that is related to or connected with questions, often in the form of a survey or questionnaire.
Think of 'question' as a way to seek information, and '-ary' means relating to. So, a questionary is something that relates to asking questions.