1. A person you know well and regard with affection and trust
   "he was my best friend at the university";
   - china [Brit, informal], mate [Brit, informal]
    
2. An associate who provides cooperation or assistance
   "He proved to be a true friend during difficult times";
   - ally
    
3. A person with whom you are acquainted
   "we are friends of the family";
   - acquaintance
    
4. A person who backs a politician or a team etc.
   "they are friends of the library";
   - supporter, protagonist, champion, admirer, booster

1. Add someone to a list of friends on a social networking site
   "I friended my colleague on Facebook after the conference"

1. A member of the Religious Society of Friends founded by George Fox (the Friends have never called themselves Quakers)
   - Quaker

Derived forms: friended, Friends, friends, friending

Type of: actor, advocate, advocator, associate, Christian, doer, exponent, proponent, worker

Antonym: enemy

Part of: Quakers, Religious Society of Friends, Society of Friends

Encyclopedia: Friend, Peter