ques ‧ tion ‧ naire /ˌkwestʃəˈneə, ˌkes- $ -ˈner/ BrE AmE noun [countable]
[ Word Family: noun : ↑ question , questioning, ↑ questioner , ↑ questionnaire ; adjective : ↑ questionable ≠ ↑ unquestionable , ↑ questioning ≠ ↑ unquestioning , ↑ unquestioned ; adverb : ↑ unquestionably , ↑ questioningly ≠ ↑ unquestioningly ; verb : ↑ question ]
[ Date: 1800-1900 ; Language: French ; Origin: questionner 'to question' ]
a written set of questions which you give to a large number of people in order to collect information
fill in/fill out/complete a questionnaire (=answer all the questions in it)
All staff were asked to fill in a questionnaire about their jobs.