acquaintance, acquaintant 1. Knowledge of a person acquired by a relationship less intimate than friendship; a relationship based on such knowledge; a person known to one, but usually not a close friend. : 'We struck up an acquaintance with our new neighbor.' 2. A person whom one knows; the state of being acquainted. 3. Knowledge or information ab... Found on http://www.wordinfo.info/words/index/info/view_unit/3445/