1. (a.) Thoroughly informed on a subject; intimately acquainted\.

2. (a.) Familiar or acquainted by use or study; well-informed; versed; -- generally used with, sometimes with in.

3. (a.) Concerned; occupied.

4. (n.) One who converses with another; a converser.

abreast accomplished acquainted acquainted with alive apprehending apprehensive at concert pitch at home in at home with au courant au fait awake career coached cognizant comprehending conscious conversant with familiar with finished informed informed in initiate initiated intimate with knowing master of no stranger to perceptive percipient practiced prepared primed professional proficient in sensible sentient skilled strong in technical trained up up on up-to-date used to versed versed in well-read in witting