Meaning

verb be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about

verb know how to do or perform something

verb be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt

originFrom Middle English knowen, from Old English cnāwen (past participle). Morphologically know + -n.

Etymology from Wiktionary, CC BY-SA 3.0