RSVP - Wikipedia
https://en.wikipedia.org/wiki/RSVP
WEBRSVP is an initialism derived from the French phrase Répondez s'il vous plaît, meaning "Respond, if it pleases you", or just "Please respond", to require confirmation of an invitation. The initialism "RSVP" is no longer used much in France, where it is considered formal and old-fashioned.
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