(typography) The punctuation mark "?", used at the end of a sentence to indicate a question. / (figuratively, informal) A state of doubt or uncertainty.

A sentence, phrase or word which asks for information, reply or response; an interrogative. / A subject or topic for consideration or investigation.

(transitive) To ask questions of; to interrogate; to ask for information. / (transitive) To raise doubts about; have doubts about.

A form containing a list of questions; a means of gathering information for a survey

to survey using questionnaires

A person who asks questions, or who conducts an official enquiry.

Problematic; open to doubt or challenge. / Of dubious respectability or morality. / (obsolete) Inviting questions; inviting inquiry.

(idiomatic) Not remotely possible.

(idiomatic, informal) To propose marriage.

An online document containing a list of the questions most often asked about a particular subject, together with answers.