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Check that you understand what this abbreviation means in this document R.S.V.P. stands for a French phrase, "répondez, s'il vous plaît," which means "please reply." The person sending the invitation would like you to tell him or her whether you accept the invitation or not. That is, will you be coming to the event or not? Etiquette rules followed in most Western cultures require that if you receive a formal, written invitation, you should reply as soon as possible, perhaps that same day.