Word Origin & History
please (v.)
c.1325, "to be agreeable," from O.Fr. plaisir (Fr. plaire) "to please," from L. placere "to be acceptable, be liked, be approved," related to placare "to soothe, quiet," from PIE base *p(e)lag- "to smooth, make even" (cf. Gk. plax, gen. plakos "level surface," plakoeis "flat;" Lett. plakt "to become flat;" O.N. flaga "layer of earth;" Norw. flag "open sea;" O.E. floh "piece of stone, fragment;" O.H.G. fluoh "cliff"). Intransitive sense (e.g. do as you please) first recorded 1500; imperative use (e.g. please do this), first recorded 1622, was probably a shortening of if it please (you) (1388). Verbs for "please" supply the stereotype polite word ("Please come in," short for may it please you to ...) in many languages (Fr., It.), "But more widespread is the use of the first singular of a verb for 'ask, request' " [Buck, who cites Ger. bitte, Pol. prasze, etc.] Sp. favor is short for hace el favor "do the favor." Dan. has in this sense vær saa god, lit. "be so good."