RSVP stands for 'Repondez s'il vous plaît, ' which is French for 'please REPLY.' It is a common acronym used in invitations to indicate that the recipient should respond to the invitation. The crossword solutions for RSVP are 'REPLY' (5 letters) and 'ANS' (3 letters). 'REPLY' is an English word meaning to respond to a question or statement, while 'ANS' is an abbreviation of the word 'ANSWER, ' which is also used to mean a response to a question or statement.