The Oxford Thesaurus An A-Z Dictionary of Synonyms - acquaintedadj.

1) known to each other or one another, familiar with each other or one another, on speaking terms: I have known Rory for years, but his wife and I are not acquainted. 2) acquainted with. familiar with, known to, aware of, informed of, knowledgeable of, conversant with: I have studied trigonometry, but I am not acquainted with calculus.