1. Factual information that a person knows
   "Her knowledge of history was impressive"
    
2. The (technical) knowledge and skill required to do something
   "His knowledge in computer programming was invaluable to the project";
   - know-how
    
3. Everything that is known
   "the current state of knowledge about climate change"

Derived forms: knowledges

Type of: ability, power

Encyclopedia: Knowledge, Skills, and Abilities