The term PART OF RSVP is composed of four words: PLAIT (5 letters), ESS (3 letters), VOUS (4 letters), and SIL (3 letters). PLAIT is an old-fashioned word for a braid or PLAIT of hair, ESS is a shortened form of the French word 'vous', meaning 'YOU', VOUS is the French word for 'YOU' in the formal sense, and SIL is a shortened form of the French word 'vous', meaning 'yourself'. Together, these words make up the acronym RSVP, which stands for 'Repondez s'il vous plaît', meaning 'Please respond' in French.