The Collaborative International Dictionary of English v.0.48:

Conversant \Con"ver*sant\, a. [L. conversans, p. pr. of
   conversari: cf. F. conversant.]
   1. Having frequent or customary intercourse; familiary
      associated; intimately acquainted.
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            I have been conversant with the first persons of the
            age.                                  --Dryden.
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   2. Familiar or acquainted by use or study; well-informed;
      versed; -- generally used with with, sometimes with in.
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            Deeply conversant in the Platonic philosophy.
                                                  --Dryden.
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            he uses the different dialects as one who had been
            conversant with them all.             --Pope.
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            Conversant only with the ways of men. --Cowper.
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   3. Concerned; occupied.
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            Education . . . is conversant about children. --W.
                                                  Wotton.
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The Collaborative International Dictionary of English v.0.48:

Conversant \Con*vers"ant\, n.
   One who converses with another; a convenser. [R.]
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WordNet (r) 3.0 (2006):

conversant
    adj 1: (usually followed by `with') well informed about or
           knowing thoroughly; "conversant with business trends";
           "familiar with the complex machinery"; "he was familiar
           with those roads" [syn: conversant(p), familiar(p)]