What is know?

(verb): Be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about.
Example: "I know that the President lied to the people"; "I want to know who is winning the game!"; "I know it's time"
Synonyms: cognize, cognise
See also — Additional definitions below

More definitions of "know":

(verb): Have fixed in the mind.
Example: "I know Latin"; "This student knows her irregular verbs"; "Do you know the poem well enough to recite it?"

(verb): Accept (someone) to be what is claimed or accept his power and authority.
Synonyms: acknowledge, recognize, recognise

(verb): Know how to do or perform something.
Example: "She knows how to knit"; "Does your husband know how to cook?"

(verb): Know the nature or character of.
Example: "We all knew her as a big show-off"

(verb): Perceive as familiar.
Example: "I know this voice!"

(verb): Have sexual intercourse with.
Synonyms: roll in the hay, love, make out, make love, sleep with, get laid, have sex, do it, be intimate, have intercourse, have it away, have it off, screw, fuck, jazz, eff, hump, lie with, bed, have a go at it, bang, get it on, bonk

(verb): Be able to distinguish, recognize as being different.
Example: "The child knows right from wrong"

(verb): Have firsthand knowledge of states, situations, emotions, or sensations.
Example: "I know the feeling!"
Synonyms: experience, live

(verb): Be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt.
Example: "I know that I left the key on the table"; "Galileo knew that the earth moves around the sun"

(verb): Be familiar or acquainted with a person or an object.
Example: "She doesn't know this composer"; "Do you know my sister?"; "We know this movie"; "I know him under a different name"; "This flower is known as a Peruvian Lily"