The word "know" refers to the ability to be aware of something or to have information or understanding about it. It implies having knowledge through experience, education, or reasoning.
The word "know" comes from the Old English "cnāwan," which means "to recognize, acknowledge, or have knowledge of." It is related to similar words in other Germanic languages, tracing back to the Proto-Germanic "knāwō," and ultimately to the Proto-Indo-European root "gno-," meaning "to know."