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please [please 词源字典]: please: [14] Please is at the centre of a small family of English words that go back to Latin placēre ‘please’ (a derivative of the same base as produced plācāre ‘calm, appease’, source of English implacable [16] and placate [17]). Related English words that started life in Latin include complacent, placebo, and placid [17]. It reached English via Old French plaisir, and other derivatives picked up via Old French or Anglo-Norman are plea, plead, pleasant [14], and pleasure [14] (originally a noun use of the verb plaisir).
=> complacent, implacable, placate, placebo, placid, plea, plead, pleasant, pleasure[please etymology, please origin, 英语词源]
displease (v.): early 14c., from Old French desplais-, present tense stem of desplaisir "to displease" (13c.), from Latin displicere "displease," from dis- "not" (see dis-) + placere "to please" (see please). Related: Displeased; displeasing.
displeasure (n.): early 15c., from Old French desplaisir, infinitive used as a noun (see displease). Earlier in same sense was displesaunce (late 14c.).
pleasance (n.): late 14c., from Old French plaisance "pleasure, delight, enjoyment," from plaisant (see pleasant).
pleasant (adj.): late 14c. (early 14c. as a surname), from Old French plaisant "pleasant, pleasing, agreeable" (12c.), present participle of plaisir "to please" (see please). Pleasantry has the word's modern French sense of "funny, jocular." Related: Pleasantly.
pleasantry (n.): "sprightly humor in conversation," 1650s, from French plaisanterie "joke, jest; joking, jesting," from plaisant (see pleasant). Related: Pleasantries.
please (v.): early 14c., "to be agreeable," from Old French plaisir "to please, give pleasure to, satisfy" (11c., Modern French plaire, the form of which is perhaps due to analogy of faire), from Latin placere "to be acceptable, be liked, be approved," related to placare "to soothe, quiet" (source of Spanish placer, Italian piacere), possibly from PIE *plak-e- "to be calm," via notion of still water, etc., from root *plak- (1) "to be flat" (see placenta).

Meaning "to delight" in English is from late 14c. Inverted use for "to be pleased" is from c. 1500, first in Scottish, and paralleling the evolution of synonymous like (v.). Intransitive sense (do as you please) first recorded c. 1500; imperative use (please do this), first recorded 1620s, was probably a shortening of if it please (you) (late 14c.). Related: Pleased; pleasing; pleasingly.

Verbs for "please" supply the stereotype polite word ("Please come in," short for may it please you to ...) in many languages (French, Italian), "But more widespread is the use of the first singular of a verb for 'ask, request' " [Buck, who cites German bitte, Polish proszę, etc.]. Spanish favor is short for hace el favor "do the favor." Danish has in this sense vær saa god, literally "be so good."
pleased (adj.): "satisfied, contented," late 14c., past participle adjective from please (v.).
pleaser (n.): 1520s, agent noun from please.
pleasurable (adj.): 1570s, from pleasure (n.) + -able. Related: Pleasurability; pleasurably. For sense, compare comfortable.
pleasure (n.): late 14c., "condition of enjoyment," from Old French plesir, also plaisir "enjoyment, delight, desire, will" (12c.), from noun use of infinitive plaisir (v.) "to please," from Latin placere "to please, give pleasure, be approved" (see please (v.)). Ending altered in English 14c. by influence of words in -ure (measure, etc.). Meaning "sensual enjoyment as the chief object of life" is attested from 1520s.
pleasure (v.): 1530s, "to take pleasure in;" 1550s as "give pleasure to," from pleasure (n.). Sexual sense by 1610s. Related: Pleasured; pleasuring.
pleasure-seeker (n.): from pleasure (n.) + agent noun from seek.
unpleasant (adj.): 1530s, from un- (1) "not" + pleasant (adj.). Related: Unpleasantly.
unpleasantness (n.): 1540s, "state or quality of being unpleasant," from unpleasant + -ness. By 1835 as "a slight quarrel, a minor misunderstanding." The late unpleasantness as a humorously polite Southern description of the American Civil War is attested from 1868.