- a person you know well and regard with affection and trust;
"he was my best friend at the university"
- an associate who provides cooperation or assistance;
"he's a good ally in fight"
- a person with whom you are acquainted;
"I have trouble remembering the names of all my acquaintances" "we are friends of the family"
- a person who backs a politician or a team etc.;
"all their supporters came out for the game" "they are friends of the library"
- a member of the Religious Society of Friends founded by George Fox (the Friends have never called themselves Quakers)