knowledge

n. 1 a (usu. Foll. By of) awareness or familiarity (of or with a person or thing) (have no knowledge of that). B person's range of information. 2 a (usu. Foll. By of) understanding of a subject etc. (good knowledge of greek). B sum of what is known (every branch of knowledge).  to my knowledge as far as i know.

v. i. The act or state of knowing; clear perception of fact, truth, or duty; certain apprehension; familiar cognizance; cognition.