luxuryyoudaoicibaDictYouDict[luxury 词源字典]
luxury: [14] Luxury was originally a pejorative word, denoting ‘sinful self-indulgence’. Not until the 17th century did it begin to acquire its positive modern connotations of costliness, comfort, and desirability. It came via Old French from Latin luxuria ‘excess’, a derivative of luxus ‘excess, abundance, extravagance’. The Latin derived verb luxuriāre ‘grow profusely’ has given English luxuriant [16] and luxuriate [17].
[luxury etymology, luxury origin, 英语词源]
luxury (n.)youdaoicibaDictYouDict
c. 1300, "sexual intercourse;" mid-14c., "lasciviousness, sinful self-indulgence," from Old French luxurie "debauchery, dissoluteness, lust" (Modern French luxure), from Latin luxuria "excess, luxury, extravagance, profusion; delicacy" (source also of Spanish lujuria, Italian lussuria), from luxus "excess, extravagance, magnificence," probably a figurative use of luxus (adj.) "dislocated," which is related to luctari "wrestle, strain" (see reluctance).

Meaning "sensual pleasure" is late 14c. Lost its pejorative taint 17c. Meaning "habit of indulgence in what is choice or costly" is from 1630s; that of "sumptuous surroundings" is from 1704; that of "something enjoyable or comfortable beyond life's necessities" is from 1780. Used as an adjective from 1916.