1. facts, information, and skills acquired through experience or education
2. awareness or familiarity gained by experience of a fact or situation
3. the theoretical or practical understanding of a subject

Examples

• She has extensive knowledge of ancient history.
• His knowledge of computers helped him fix the problem.
• The teacher shared her knowledge with eager students.
• Without knowledge of the local customs, tourists often make mistakes.
• Scientific knowledge continues to expand every year.
• He spoke with knowledge and confidence about the subject.
• The library is a treasure trove of human knowledge.