What is the full form of RSVP? [closed]

Solution 1:

RSVP is indeed French and it stands for répondez s'il vous plaît. It literally means "please respond".

RSVP is now a fixed idiom, even in French. If you spell it out in English, very few people will understand what you mean. You are better off keeping it as an acronym or coming up with something that is purely English if you don't want an acronym.

Solution 2:

It's a French abbreviation for « Répondez, s'il vous plaît », meaning "Please respond." (Literally, « s'il vous plaît » means "if it pleases you". However, no French speaker thinks of it that way — it's just the way to say "please".)

A "pure" English alternative might be, "The favor of your reply is appreciated."