a person known to one, but usually not a close friend.

the state of being acquainted.

personal knowledge as a result of study, experience, etc.

a good acquaintance with French wines.

( used with a plural verb ) the persons with whom one is acquainted.

noun

stranger , ignorance , strangeness , unfamiliarity , unacquaintance

noun

associate , association , colleague , companion , contact , friend , neighbor , awareness , cognizance , conversance , familiarity , fellowship , grasp , intimacy , ken , relationship , understanding , experience , comrade , conversancy , friendship , kith , mate