noun
acquaintance; someone you know by sight
Refers to a person you know well enough to recognize and exchange greetings, but not a close friend. Often used in contrast with 友達 (friend).
彼はただの顔見知りで、友達ではない。
He's just an acquaintance, not a friend.
近所に顔見知り
I have a few acquaintances in the neighborhood.