adj. 25B6; adjective FAMILIAR, acquainted, au fait, au courant, at home, well versed, well informed, knowledgeable, informed, abreast, up to date; informal up to speed, clued up, genned up; formal cognizant.
CONVERSANT
Meaning of CONVERSANT in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012