adj. 1.well known or easily recognized 2.within normal everyday experience 3.(usually followed by `with') well informed about or knowing thoroughly 4.having mutual interests or affections familiar n. 1.a person attached to the household of a high official (as a pope or bishop) who renders service in return for support 2.a person who is frequently in the company of another 3.a spirit (usually in animal form) that acts as an assistant to a witch or wizard