- acquaintance (n.)
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[acquaintance 词源字典] - c. 1300, "state of being acquainted;" late 14c., "person with whom one is acquainted;" also "personal knowledge;" from Old French acointance "acquaintance, friendship, familiarity," noun of action from acointer (see acquaint). Acquaintant (17c.), would have been better in the "person known" sense but is now obsolete.[acquaintance etymology, acquaintance origin, 英语词源]