Meaning of “knowledge” - Learner’s Dictionary

knowledge

noun uk us /ˈnɒlɪdʒ/

B1 [ U, no plural ] information and understanding that you have in your mind:

He will easily find a job with his knowledge and skills.
He has a detailed knowledge of naval history.
He took the car without my knowledge (= I did not know).
to (the best of) sb's knowledge

B2 used to say that someone thinks that something is true, but cannot be sure:

To the best of my knowledge, she's never worked abroad.

(Definition of “knowledge” from the Cambridge Learner’s Dictionary © Cambridge University Press)