to make more or less familiar, aware, or conversant (usually followed by with): to acquaint the mayor with our plan.
2.
to furnish with knowledge; inform (usually followed by with): to acquaint the manager with one's findings.
3.
to bring into social contact; introduce (usually followed by with): She acquainted her roommate with my cousin.
Origin: 1250–1300; Middle English aqueinten, acointen < Anglo-French acointer,Old French acoint(i)er, verbal derivative of acointe familiar, known < Latin accognitus, 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;"