friend in WordNet English dictionary

1. a person with whom you are acquainted
   "I have trouble remembering the names of all my acquaintances"; "we are friends of the family"
   acquaintance  friend 
   
2. a person who backs a politician or a team etc.
   "all their supporters came out for the game"; "they are friends of the library"
   supporter  protagonist  champion  admirer  booster  friend 
   
3. an associate who provides cooperation or assistance
   "he's a good ally in fight"
   ally  friend 
   
4. a person you know well and regard with affection and trust
   "he was my best friend at the university"
   friend