Knowledge (noun)

  1. Facts, information, and skills acquired by a person through experience or education; the theoretical or practical understanding of a subject.
  2. Awareness or familiarity gained by experience of a fact or situation.
  3. The body of truth, information, and principles acquired by mankind.

Origin:

Middle english: from old english cnāwleð, from cnāwan "to know" + -leð "-ness".

Examples:

  1. He has a vast knowledge of music.
  2. She has knowledge of the subject.
  3. He acquired knowledge from his studies.
  4. Her knowledge of the subject impressed us.
  5. He has a lot of knowledge about cars.
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