Merriam-Webster's Collegiate® Dictionary, 11th Edition
KNOW
I. verb (knew; known; knowing)
Etymology: Middle English, from Old English cnāwan; akin to Old High German bichnāan to recognize, Latin gnoscere, noscere to come to know, Greek gignōskein Date: before 12th century transitive verb
1. a. to perceive directly ; have direct cognition of, to have understanding of , to recognize the nature of ; discern , b. to recognize as being the same as something previously known, to be acquainted or familiar with, to have experience of,
2. to be aware of the truth or factuality of ; be convinced or certain of, to have a practical understanding of , to have sexual intercourse with, intransitive verb to have knowledge, to be or become cognizant, knowable adjective knower noun
II. noun
Date: 1592
knowledge