ACQUAINTANCE meaning: 1 : someone who is known but who is not a close friend; 2 : the state of knowing someone in a personal or social way the state of knowing someone as an acquaintance Definition of acquaintance noun from the Oxford Advanced Learner's Dictionary. [countable] a person that you know but who is not a close friend. Claire has a wide circle of friends and acquaintances . He's just a business acquaintance. I bumped into an old acquaintance on the train. Learn the meaning of acquaintance as a noun, with examples of usage and common expressions. Find out how to pronounce acquaintance and how to translate it in different languages. An acquaintance is someone you know a little about, but they’re not your best friend or anything. Acquaintance is also having knowledge about something specific, like horror films or the farming techniques of Chinese peasants.