Definition of


  1. (noun, cognition) the fact of being aware of information that is known to few people
  2. (verb, cognition) be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about
    I want to know who is winning the game!
    I know it's time
  3. (verb, cognition) know how to do or perform something
    Does your husband know how to cook?
  4. (verb, cognition) be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt
    Galileo knew that the earth moves around the sun
  5. (verb, cognition) be familiar or acquainted with a person or an object
    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. (verb, cognition) have firsthand knowledge of states, situations, emotions, or sensations
    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
  7. (verb, cognition) accept (someone) to be what is claimed or accept his power and authority
    We do not recognize your gods
  8. (verb, cognition) have fixed in the mind
    This student knows her irregular verbs
    Do you know the poem well enough to recite it?
  9. (verb, contact) have sexual intercourse with
    Adam knew Eve
    Were you ever intimate with this man?
  10. (verb, cognition) know the nature or character of
  11. (verb, cognition) be able to distinguish, recognize as being different
  12. (verb, cognition) perceive as familiar

via WordNet, Princeton University

Antonyms of Know


Origin of the word Know

  1. O.E. cnawan (class VII strong verb; past tense cneow, pp. cnawen), from P.Gmc. *knoeanan (cf. O.H.G. bi-chnaan, ir-chnaan "to know"), from PIE base *gno- "to know" (cf. O.Pers. x?nasatiy "he shall know;" O.C.S. znati, Rus. znat "to know;" L. gnoscere; Gk. *gno-, as in gignoskein; Skt. jna-more

via Online Etymology Dictionary, ©2001 Douglas Harper

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a unit of information equal to 1024 mebibits or 2^30 (1,073,741,824) bits