acquaintance in WordNet English dictionary

1. personal knowledge or information about someone or something
   acquaintance  familiarity  conversance  conversancy 
   
2. 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 
   
3. a relationship less intimate than friendship
   acquaintance  acquaintanceship