versant

A gadget lover, Alexander is known to roll up his sleeves to become versant with the latest security technologies.

From Reuters ● May 26, 2013

In the south-western versant the largest river is the Kapuas, which, rising near the centre of the island, falls into the sea between Mampawa and Sukadana after a long and winding course.

From Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" by Various

Llan means a level place generally, as most of your readers who are versant in those subjects know.

From Notes and Queries, Vol. IV, Number 110, December 6, 1851 A Medium of Inter-communication for Literary Men, Artists, Antiquaries, Genealogists, etc. by Various

Diaz calls the two last, Teuleticle and Teatical; but though his facts are fully more to be depended upon, Clavigero may be accounted better versant in Mexican orthography.--E.

From A General History and Collection of Voyages and Travels — Volume 04 Arranged in Systematic Order: Forming a Complete History of the Origin and Progress of Navigation, Discovery, and Commerce, by Sea and Land, from the Earliest Ages to the Present Time by Robert Kerr

Those versant in the matter can alone venture to undertake it with common hives, whereas, every cultivator can do it himself with the leaf hives.

From New observations on the natural history of bees by François Huber