to perceive or understand as fact or truth; to apprehend clearly and with certainty

I know the situation fully.

to have established or fixed in the mind or memory

to know a poem by heart; Do you know the way to the park from here?

to be cognizant or aware of

I know it.

be acquainted with (a thing, place, person, etc.), as by sight, experience, or report

to know the mayor.

to understand from experience or attainment (usually fol. by how before an infinitive)

to know how to make gingerbread.

to be able to distinguish, as one from another

to know right from wrong.

Archaic . to have sexual intercourse with.

to have knowledge or clear and certain perception, as of fact or truth.

to be cognizant or aware, as of some fact, circumstance, or occurrence; have information, as about something.

the fact or state of knowing; knowledge. ?

in the know, possessing inside, secret

or special information.

know the ropes

Informal . to understand or be familiar with the particulars of a subject or business

He knew the ropes better than anyone else in politics.

verb

misinterpret , misunderstand , be ignorant , forget

verb

apperceive , appreciate , apprehend , be acquainted , be cognizant , be conversant in , be informed , be learned , be master of , be read , be schooled , be versed , cognize , comprehend , differentiate , discern , discriminate , distinguish , experience , fathom , feel certain , get the idea , grasp , have , have down pat , have information , have knowledge of , keep up on , ken , learn , notice , on top of , perceive , prize , realize , recognize , see , undergo , associate , be acquainted with , be friends with , feel , fraternize , get acquainted , have dealings with , identify , savor , sustain , taste , compass , understand , go through , meet , suffer , separate , tell , profess