The apprehension of fact or truth with the mind; clear and certain perception of fact or truth; the state or condition of knowing fact or truth.

Theoretical or intellectual understanding, as distinct from moral conviction. Paired or contrasted with conscience. Obsolete.

something that most people know, have learned, or accept as the truth from experience or everyday life, rather than from research or study.

sometimes contradistinguished from prudence (see quots.). Obsolete.

Understanding of nature or reality; the totality of what is known to be true; knowledge. Cf. sense A. 6.