the accumulation of facts through observing, learning, and respecting
Knowledge is the foundation of all in existence, for it must be known in order to make it manifest. Knowledge is the light given off by our sun, which is the foundation of our solar system. It is also the original man, who is the foundation of Allah's family.
Anything we experience. Experience includes to think and to perceive. To experience is to connect to Existence. For conscious beings like us, to experience is to be (and vice versa). At a given moment, one knows nothing except for what one is currently experiencing.
I am currently experiencing the thought/idea of 2+2=4. Therefore, at the moment i know (have the knowledge of) 2+2=4