acquaintance

nouns

personal knowledge or information about someone or something
acquaintance, conversance, conversancy, familiarity
is derived from
acquaint
a relationship less intimate than friendship
acquaintance, acquaintanceship
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
antonym
stranger
is derived from
acquaintanceship
antonym
stranger