n 1: a person you know well and regard with affection and trust; "he was my best friend at the university" 2: an associate who provides assistance; "he's a good ally in fight"; "they were friends of the workers" [syn: ally] [ant: foe] 3: a person with whom you are acquainted; "I have trouble remembering the names of all my acquaintances"; "we are friends of the family" [syn: acquaintance] 4: a person who backs a politician or a team etc.; "all their supporters came out for the game"; "they are friends of the library" [syn: supporter, protagonist, champion, admirer, booster] 5: a member of the Religious Society of Friends founded by George Fox (the Friends have never called themselves Quakers) [syn: Friend, Quaker]