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

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

The one Costa Rican locality of record also is in the Caribbean versant.

From Noteworthy Records of Bats From Nicaragua, with a Checklist of the Chiropteran Fauna of the Country by J. Knox Jones

For this purpose, they gave orders to Diego Garcias de Alfaro, an inhabitant of Lima who was versant in maritime affairs, to repair and fit out the two barks which had drifted on shore.

From A General History and Collection of Voyages and Travels - Volume 05 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

The Golfo Dulce region and the Caribbean versant are humid and inhabited by Hyla elaeochroa.

From The Systematics of the Frogs of the Hyla Rubra Group in Middle America by Juan R. león