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From The Collaborative International Dictionary of English v.0.48:
questionnaire \ques`tion`naire"\, n.; pl. -naires (F. ?). [F.] 1. same as Questionary. [Webster 1913 Suppl.] 2. A list of questions, usually on a printed form, to be answered by an individual. The forms often have blank spaces in which the answers can be written. Sets of such forms are distributed to groups and the answers used for various purposes, such as to obtain statistical information for social science, political, or marketing research, or to obtain information about a patient for the use of medical practitioners. [PJC]