late 14c., "a question;" c. 1500, "a questioning; a set of questions," from Old French interrogacion (13c.) or directly from Latin interrogationem (nominative interrogatio) "a question, questioning, interrogation," noun of action from past participle stem of interrogare "to ask, question, inquire, interrogate," from inter- "between" (see inter-) + rogare "ask, to question" (see rogation).
