<prompt> Perjury is -Willful utterance of falsehoodAn act committed within cou premisesFailure to sign summonsFailure to appear as a witness  <response>: It means wilful giving of false evidence by a witness while under oath, or failure to tell what he knows or believes to be true occurs if the persons earlier statement regarding the facts on oath subsequent statement also must be on oath both statements are opposed to each other they cannot be reconciled. It falls under S.191.I.P.C. REF:The synopsis of forensic med Dr.K.S.Narayan Reddy pg no -8 29th edition. 