Etymology
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au fait (adj.)

1743, French, "to the point, to the matter under discussion," literally "to the fact," from au "to the" (see au) + fait "fact" (see feat). Used in French with sense of "acquainted with the facts, expert, fully skilled."

updated on March 01, 2017

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Definitions of au fait from WordNet

au fait (adj.)
being up to particular standard or level especially in being up to date in knowledge;
always au fait on the latest events
Synonyms: abreast / au courant / up on
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.