A sentence, phrase or word which asks for information, reply or response; an interrogative.

“What is your question?”

A subject or topic for consideration or investigation.

“The question of seniority will be discussed at the meeting.”

A doubt or challenge about the truth or accuracy of a matter.

“He obeyed without question.”

To ask questions about; to interrogate; to enquire for information.

To raise doubts about; have doubts about.

To argue; to converse; to dispute.