verb (used with object)
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 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

preacquaint, verb (used with object)
reacquaint, verb (used with object) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
acquaint (əˈkweɪnt)
vb (foll by with or of)
1.  to make (a person) familiar or conversant (with); inform (of)
2.  chiefly (US) (foll by with) to introduce (to); bring into contact (with)
[C13: via Old French and Medieval Latin from Latin accognitus, from accognōscere to know perfectly, from ad- (intensive) + cognōscere to know]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They will acquaint you with the vocabulary and the range of concerns seldom
  discussed in your graduate seminars.
Look at the slide show and acquaint yourself with a few of them you may never
  take a bunny for granted again.
Partly there is a need to acquaint readers of the book with the basic
  principles of a bill of exchange.
So's she could acquaint herself with the thing in no hurry and know what she
  was doing when the time came.
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