Source : Webster's Revised Unabridged Dictionary (1913)

Interrogate \In*ter"ro*gate\, v. t. [imp. & p. p.
   {Interrogating}.] [L. interrogatus, p. p. of interrogare to
   ask; inter between + rogare to ask. See Rogation.]
   To question formally; to question; to examine by asking
   questions; as, to interrogate a witness.

         Wilt thou, uncalled, interrogate, Talker! the
         unreplying Fate?                         --Emerson.

   Syn: To question; ask. See {Question}.

Interrogate \In*ter"ro*gate\, v. i.
   To ask questions. --Bacon.

Interrogate \In*ter"ro*gate\, n.
   An interrogation; a question. [Obs.] --Bp. Hall.

Source : WordNet®

interrogate
     v 1: transmit (a signal) for setting off an appropriate response,
          as in telecommunication
     2: pose a series of questions to; "The suspect was questioned
        by the police"; "We questioned the survivor about the
        details of the explosion" [syn: {question}]