This meaning refers to the request that a guest confirm acceptance or refusal of an invitation.
The invitation includes an RSVP by Friday.
Please send your RSVP before the deadline.
This use refers to the actual reply sent by an invited guest.
We received fifty RSVPs for the wedding.
Her RSVP indicated that she could not attend.
This verb means informing the host whether one plans to attend an event.
Please RSVP by the end of the week.
Only thirty guests had RSVPed by Monday.
