WordWeb Online

1. A vaguely specified concern
   "it is none of your affair";
   - matter, thing
    
2. A usually secretive or illicit sexual relationship
   - affaire, intimacy, liaison, involvement, amour
    
3. A formal or official social gathering or ceremony of people
   "the party was quite an affair";
   - occasion, social occasion, function, social function

Derived forms: affairs

Type of: concern, sexual relationship, social event

Encyclopedia: Affair