transitive verb knew, known, knowing know′·ing

1. to have a clear perception or understanding of; be sure of or well informed about to know the facts
2. to be aware or cognizant of; have perceived or learned to know that one is loved
3. to have a firm mental grasp of; have securely in the memory to know the multiplication tables
4. 1. to be acquainted or familiar with I knew him well
   2. to experience she has known both pleasure and pain
5. to have understanding of or skill in as a result of study or experience to know music
6. to recognize I'd know that face anywhere
7. to recognize as distinct; distinguish to know right from wrong
8. Archaic to have sexual intercourse with

Etymology: ME knowen < OE cnawan, akin to OHG -cnāhan < IE base *ĝen-, *ĝnō-, to know, apprehend > can, ken, L gnoscere, to know, Gr gignōskein

intransitive verb

1. to have knowledge
2. to be sure, informed, or aware