to make more or less familiar, aware, or conversant (usually followed by with):
to acquaint the mayor with our plan.
to furnish with knowledge; inform (usually followed by with):
to acquaint the manager with one's findings.
to bring into social contact; introduce (usually followed by with):
She acquainted her roommate with my cousin.
1250-1300;Middle Englishaqueinten, acointen < Anglo-Frenchacointer,Old Frenchacoint(i)er, verbal derivative of acointe familiar, known < Latinaccognitus, past participle of accognōscere to recognize, equivalent to ac-ac- + co-co- + gni-know + -tus past participle suffix
c.1300, from O.Fr. acointier from V.L. *accognitare "to make known," from L. accognitus, pp. of accognoscere "know well," from ad- "to" + cognitus, pp. of cogniscere "come to know," from com- "with" + gnoscere "know" (see notice). Originally reflective, "to make oneself known;" sense of "to gain for oneself personal knowledge of" is from early 14c.
early 14c., "personally known;" see acquaint. Of skills, situations, etc., from late 15c.