[know] vb knew ; known ; know.ing [ME, fr. OE cnawan; akin to OHG bichnaan to recognize, L gnoscere, noscere to come to know, Gk gignoskein] vt (bef. 12c) 1 a (1): to perceive directly: have direct cognition of (2): to have understanding of "importance of ~ing oneself" (3): to recognize the nature of: discern b (1): to recognize as being the same as something previously known (2): to be acquainted or familiar with (3): to have experience of
2. a: to be aware of the truth or factuality of: be convinced or certain of b: to have a practical understanding of "~s how to write" 3 archaic: to have sexual intercourse with ~ vi 1: to have knowledge
2: to be or become cognizant--sometimes used interjectionally with you esp. as a filler in informal speech -- know.able adj -- know.er n -- know from : to have knowledge of "didn't know from sibling rivalry --Penny Marshall"
[2]know n (1592): knowledge -- in the know : in possession of exclusive knowledge or information; broadly: well-informed