Pronunciation: (är'es'vē'pē'), [key]
—v., RSVPed or RSVP'd, RSVPing or RSVP'ing,
—n., pl. RSVP's.
to reply to an invitation: Don't forget to RSVP before Thursday.
1. a reply to an invitation: He sent a lovely bouquet of flowers with his RSVP.
2. (used on an invitation to indicate that the favor of a reply is requested). Also,R.S.V.P.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.