Learner's definition of KNOWLEDGE
1 : information, understanding, or skill that you get from experience or education
She has little/no/some knowledge of fashion/history/cooking.
He has devoted himself to the pursuit of knowledge.
a thirst/quest for knowledge
a knowledge of carpentry
She gained/acquired a thorough knowledge of local customs.
I have a reading knowledge of French [=I can read French], but I can't speak it fluently.
2 [noncount] : awareness of something : the state of being aware of something
He claimed to have no knowledge of the plan. = He denied all/any knowledge of the plan.
Did you have any knowledge of her intentions?
The decision was made without my knowledge. [=I did not know about the decision]
: something that many or most people know
: something that people know because it has been reported in the news
safe/secure in the knowledge
: feeling safe or secure because you know something specified
to someone's knowledge
: according to what someone knows — usually used in negative statements
“Did anyone arrive late?” “Not to my knowledge.”
No one arrived late to my knowledge. [=I am not aware that anyone arrived late, but it is possible that someone arrived late and I don't know about it]
to the best of my knowledge
— used to say that you think a statement is true but that there may be something you do not know which makes it untrue
To the best of my knowledge [=as far as I know], everyone arrived on time.
I answered their questions to the best of my knowledge. [=I gave the best answers I could based on what I knew, but I might have answered differently if I had known something else]