know

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To perceive directly; grasp in the mind with clarity or certainty.
2. v. To regard as true beyond doubt: I know she won't fail.
3. v. To have a practical understanding of, as through experience; be skilled in: knows how to cook.
4. v. To have fixed in the mind: knows her Latin verbs.
5. v. To have experience of: "a black stubble that had known no razor” ( William Faulkner).
6. v. To perceive as familiar; recognize: I know that face.
7. v. To be acquainted with: He doesn't know his neighbors.
8. v. To be able to distinguish; recognize as distinct: knows right from wrong.
9. v. To discern the character or nature of: knew him for a liar.
10. v. Archaic To have sexual intercourse with.
11. v. To possess knowledge, understanding, or information.
12. v. To be cognizant or aware.
13. idiom. in the know Informal Possessing special or secret information.
14. idiom. you know Informal Used parenthetically in conversation, as to fill pauses or educe the listener's agreement or sympathy: Please try to be, you know, a little quieter. How were we supposed to make camp in a storm like that, you know?

Century Dictionary and Cyclopedia

1. To Perceive or understand as being fact or truth; have a clear or distinct perception or apprehension of; understand or comprehend clearly and fully; be conscious of perceiving truly.
2. In a general sense, to have definite information or intelligence about; be acquainted with, either through the report of others or through personal ascertainment, observation, experience, or intercourse: as, to know American history; he knows the city thoroughly.
3. To recognize after some absence or change; recall to the mind or perception; revive prior knowledge of: as, he was so changed that you would hardly know him.
4. To recognize in contrast or comparison; distinguish by means of previous acquaintance or information: as, to know one man from another; we know a fixed star from a planet by its twinkling; to know the right way.
5. To understand from experience or attainment; comprehend as to manner or method: with how before an infinitive: as, to know how to make something.
6. To have sexual commerce with. Gen. iv. 1. [A euphemism.]
7. To possess knowledge; be informed; have intelligence.
8. To take cognizance; acquire knowledge; get intelligence.
9. To be acquainted with each other. You and I have known, sir.
10. n. Knowledge.
11. n. A dialectal (Scotch) form of knoll
12. n. Middle English forms of knee.

Wiktionary

1. v. transitive To be certain or sure about.
2. v. transitive To be acquainted or familiar with; to have encountered.
3. v. transitive, from To have knowledge of; to have memorised information, data, or facts about.
4. v. transitive To understand (a subject).
5. v. transitive To be informed about.
6. v. transitive To experience.
7. v. transitive, archaic, biblical To have sexual relations with.
8. n. Knowledge.

GNU Webster's 1913

1. n. obsolete Knee.
2. v. To perceive or apprehend clearly and certainly; to understand; to have full information of.
3. v. To be convinced of the truth of; to be fully assured of.
4. v. To be acquainted with; to be no stranger to; to be more or less familiar with the person, character, etc., of; to possess experience of
5. v. To recognize; to distinguish; to discern the character of.
6. v. To have sexual intercourse with.
7. v. To have knowledge; to have a clear and certain perception; to possess wisdom, instruction, or information; -- often with of.
8. v. To be assured; to feel confident.

WordNet 3.0

1. v. have firsthand knowledge of states, situations, emotions, or sensations
2. v. accept (someone) to be what is claimed or accept his power and authority
3. v. be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about
4. v. be aware of the truth of something; have a belief or faith in something; regard as true beyond any doubt
5. v. have sexual intercourse with
6. v. perceive as familiar
7. v. know how to do or perform something
8. n. the fact of being aware of information that is known to few people
9. v. be able to distinguish, recognize as being different
10. v. know the nature or character of
11. v. have fixed in the mind
12. v. be familiar or acquainted with a person or an object