Main entry: acquaintance, friend
Definition: a person with whom you are acquainted
Usage: I have trouble remembering the names of all my acquaintances; we are friends of the family
Antonyms: stranger, unknown, alien
Definition: anyone who does not belong in the environment in which they are found
Antonyms: stranger
Definition: an individual that one is not acquainted with
Main entry: ally, friend
Definition: an associate who provides cooperation or assistance
Usage: he's a good ally in fight