1) (in law)occurs when a witness testifies about something that he or she heard about but didn't witness personally.The witness isn't allowed to testify that something is true just because someone told the witness it was true. 2) information received from other people that one cannot adequately substantiate; rumor. Example sentence: 1) everything they had told him would have been ruled out as hearsay, 2)according to hearsay, Bob had managed to break his arm