au fait

from WordNet (r) 3.0 (2006)

au fait
    adj 1: being up to particular standard or level especially in
           being up to date in knowledge; "kept abreast of the
           latest developments"; "constant revision keeps the book
           au courant"; "always au fait on the latest events"; "up
           on the news" [syn: {abreast(p)}, {au courant}, {au fait},
           {up on(p)}]

from The Collaborative International Dictionary of English v.0.48

Au fait \Au` fait"\ ([=o]` f[asl]"). [F. Lit., to the deed, act,
   or point. Fait is fr. L. factum. See {Fact}.]
   Expert; skillful; well instructed.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

26 Moby Thesaurus words for "au fait":
      able, abreast, acquainted, au courant, au fond, basically,
      becoming, befitting, capable, comme il faut, competent, conforming,
      conversant, correct, decent, fundamentally, good, in essence,
      informed, nice, proper, qualified, right, up, versed, wicked

[email protected]