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The fact of knowing about something; general understanding or familiarity with a subject, place, situation etc.
His knowledge of Iceland was limited to what he'd seen on the Travel Channel.

Awareness of a particular fact or situation; a state of having been informed or made aware of something.

Intellectual understanding; the state of appreciating truth or information.
Knowledge consists in recognizing the difference between good and bad decisions.

Familiarity or understanding of a particular skill, branch of learning etc.
A secretary should have a good knowledge of shorthand.

(philosophical) Justified true belief

Sexual intimacy or intercourse (now usually in phrase carnal knowledge).

Information or intelligence about something; notice.

The total of what is known; all information and products of learning.
His library contained the accumulated knowledge of the Greeks and Romans.

Something that can be known; a branch of learning; a piece of information; a science.

Acknowledgement.

Notice, awareness.

The deep familiarity with certain routes and places of interest required by taxicab drivers working in London, England.

To confess as true; to acknowledge.