The noun acquaintance has 3 senses (first 3 from tagged texts)
1. (2) acquaintance, familiarity, conversance, conversancy -- (personal knowledge or information about someone or something)
2. (1) acquaintance, acquaintanceship -- (a relationship less intimate than friendship)
3. (1) acquaintance, friend -- (a person with whom you are acquainted; "I have trouble remembering the names of all my acquaintances"; "we are friends of the family")