n The fact of knowing about something; general understanding or familiarity with a subject, place, situation etc. (defdate|from 14th c.)
n awareness | Awareness of a particular fact or situation; a state of having been informed or made aware of something. (defdate|from 14th c.)
n familiarity | Familiarity or understanding of a particular skill, branch of learning etc. (defdate|from 14th c.)
n (archaic|_|or|_|legal) Sexual intimacy or intercourse (now usually in phrase (term|carnal knowledge)). (defdate|from 15th c.)
n (obsolete) information | Information or intelligence about something; notice. (defdate|15th-18th c.)
n (countable) Something that can be known; a branch of learning; a piece of information; a science. (defdate|from 16th c.)