Know Definition

Define what is Know?

1. know (noun)

the fact of being aware of information that is known to few people.

  • he is always in the know.

knowing noun
a clear and certain mental apprehension.

2. cognise, cognize, know (verb)

be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about.

  • I know that the President lied to the people.
  • I want to know who is winning the game!.
  • I know it's time.
Synonyms: cognise, cognize
Antonyms: ignore (verb)

be ignorant of or in the dark about.


keep track verb
keep informed of fully aware.

agnise, agnize, realize, recognize, realise, recognise verb
be fully aware or cognizant of.

3. know (verb)

know how to do or perform something.

  • She knows how to knit.
  • Does your husband know how to cook?.

be on the ball, be with it, know the score, know what's going on, know what's what verb
be well-informed.

master, control verb
have a firm understanding or knowledge of; be on top of.

get the hang, master verb
be or become completely proficient or skilled in.

4. know (verb)

be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt.

  • I know that I left the key on the table.
  • Galileo knew that the earth moves around the sun.

foreknow, foresee, previse, anticipate verb
realize beforehand.

5. know (verb)

be familiar or acquainted with a person or an object.

  • 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.

6. experience, know, live (verb)

have firsthand knowledge of states, situations, emotions, or sensations.

  • I know the feeling!.
  • have you ever known hunger?.
  • I have lived a kind of hell when I was a drug addict.
  • The holocaust survivors have lived a nightmare.
  • I lived through two divorces.
Synonyms: experience, live

experience, go through, see verb
go or live through.


taste verb
experience briefly.

live over, relive verb
experience again, often in the imagination.

7. recognize, acknowledge, know, recognise (verb)

accept (someone) to be what is claimed or accept his power and authority.

  • The Crown Prince was acknowledged as the true heir to the throne.
  • We do not recognize your gods.

accept verb
consider or hold as true.

8. know (verb)

have fixed in the mind.

  • I know Latin.
  • This student knows her irregular verbs.
  • Do you know the poem well enough to recite it?.

have down verb
have (something) mastered.

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

have sexual intercourse with.

  • This student sleeps with everyone in her dorm.
  • Adam knew Eve.
  • Were you ever intimate with this man?.

copulate, mate, couple, pair verb
engage in sexual intercourse.


have, take verb
have sex with; archaic use.

fornicate verb
have sex without being married.

10. know (verb)

know the nature or character of.

  • we all knew her as a big show-off.

agnise, agnize, realize, recognize, realise, recognise verb
be fully aware or cognizant of.

11. know (verb)

be able to distinguish, recognize as being different.

  • The child knows right from wrong.

12. know (verb)

perceive as familiar.

  • I know this voice!.

recall, recollect, remember, call back, call up, retrieve, think verb
recall knowledge from memory; have a recollection.

Nearby Terms

know apart (verb)
recognize or perceive the difference

know nothing (noun)
an ignorant person

know the score (verb)
be well-informed

know what's going on (verb)
be well-informed

know what's what (verb)
be well-informed

know-all (noun)
someone who thinks he knows everything and refuses to accept advice or information from others

know-how (noun)
the (technical) knowledge and skill required to do something

know-it-all (noun)
someone who thinks he knows everything and refuses to accept advice or information from others

Know-Nothing Party (noun)
a former political party in the United States; active in the 1850s to keep power out of the hands of immigrants and Roman Catholics

knowable (adjective)
capable of being known

knower (noun)
a person who knows or apprehends

knowing (noun)
a clear and certain mental apprehension

knowingly (adverb)
with full knowledge and deliberation

knowingness (noun)
having knowledge of

knowledge (noun)
the psychological result of perception and learning and reasoning