know
UK[nəʊ]US[noʊ]
v
To have information in your mind as a result of experience or because you have learned it.
v
To be familiar with a person, place, or thing because you have met them, been there, or used it before.
v
To be aware of a fact or piece of information.
Etymology
The verb 'know' originates from the Old English 'cnāwan', meaning "to perceive, recognize, or understand." This term traces back further to the Proto-Germanic 'knēaną', which carried the sense of "to know how to, to be able to." The ultimate source is the Proto-Indo-European root 'ǵneh₃-', signifying "to know." This ancient root is the prolific ancestor of a vast family of knowledge-related words across many languages, including Greek 'gnosis' (knowledge), Latin 'cognoscere' (to get to know), and Sanskrit 'jñā' (to know). The semantic journey from the concrete PIE sense of perceiving or recognizing evolved into the modern, more abstract concepts of possessing information, being acquainted with, and understanding.
Analysis
The word 'know' is a simplex word derived from a single, indivisible Old English root.
Examples
I know the answer to that question.
Do you know how to get to the station from here?
She has known him since they were children.