As a Noun: 1. A written list of questions which are answered by a lot of people in order to provide information for a report. English = questionnaire. 2. A detailed investigation of something, for example people's behaviour or opinions. English = survey. As a Verb or Adjective: 1. To do a questionnaire. 2. A series of identical questions put to a number of people or organisations in order to find out their opinions, behaviours or attitudes toward a specific topic, service or product. English = survey 3.