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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.
Historical Examples

The painful task of acquainting Mrs. Krause with the fate of her husband fell to the lot of Mr. Botha and Mr. Hocke.
The Petticoat Commando Johanna Brandt

He had telegraphed to her, acquainting her with his defeat, and telling her to expect his return.
The Prime Minister Anthony Trollope

Father John was consulted, and Father John advised the necessity of at once acquainting the police.
Sue, A Little Heroine L. T. Meade

He wrote a letter to his friend, Ralph Richmond, acquainting him of this fact.
The Lonely Unicorn Alec Waugh

Then devise some means of acquainting his friends of his whereabouts.
A Bid for Fortune Guy Boothby

We have said that it became the means of acquainting them with the language of the land.
Creed And Deed Felix Adler

Your generous conduct in acquainting Mr. White with the vexatious affair at Malta highly pleased him.
Mary Lamb Anne Burrows Gilchrist

Obeying an unformed policy, David refrained from acquainting her with the truth.
To Him That Hath Leroy Scott

He was so much surprised at this that he ventured to dispatch a short note, acquainting her of the sudden illness of his wife.
The Champdoce Mystery Emile Gaboriau

The king lost no time in acquainting the diet with his demands.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 8 Various

verb (transitive)
foll by with or of. to make (a person) familiar or conversant (with); inform (of)
(foll by with) (mainly US) to introduce (to); bring into contact (with)
v.

early 13c., from Old French acointier “make known, make acquaintance of,” from Vulgar Latin accognitare “to make known,” from Latin accognitus “acquainted with,” past participle of accognoscere “know well,” from ad- “to” (see ad-) + cognitus, past participle of cogniscere “come to know,” from com- “with” (see com-) + gnoscere “know” (see notice). Originally reflective, “to make oneself known;” sense of “to gain for oneself personal knowledge of” is from early 14c. Related: Acquainted; acquainting.