Origin: bef. 900; ME
knowen, knawen, OE
gecnāwan; c. OHG
-cnāhan, ON
knā to know how, be able to; akin to L (
g)
nōvī, Gk
gign
skein. See gnostic, can 1 
Related forms: knower, noun
Synonyms:
1. Know, comprehend, understand imply being aware of meanings. To know is to be aware of something as a fact or truth: He knows the basic facts of the subject. I know that he agrees with me. To comprehend is to know something thoroughly and to perceive its relationships to certain other ideas, facts, etc. To understand is to be fully aware not only of the meaning of something but also of its implications: I could comprehend all he said, but did not understand that he was joking.