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.
1. Hammer's business pedigree almost gua-ranteed him the acquaintance of U.S. presidents.
2. I am so pleased to make your acquaintance, Mr Tweed.
3. On first acquaintance she is cool and slightly distant.
4. I first made his acquaintance in the early 1960s.
5. Her manner seemed unpleasant at first, but she improved on further acquaintance.