The Collaborative International Dictionary of English v.0.48:

Know \Know\ (n[=o]), v. t. [imp. Knew (n[=u]); p. p. Known
   (n[=o]n); p. pr. & vb. n. Knowing.] [OE. knowen, knawen,
   AS. cn[aum]wan; akin to OHG. chn[aum]an (in comp.), Icel.
   kn[aum] to be able, Russ. znate to know, L. gnoscere,
   noscere, Gr. gighw`skein, Skr. jn[=a]; fr. the root of E.
   can, v. i., ken. [root]45. See Ken, Can to be able, and
   cf. Acquaint, Cognition, Gnome, Ignore, Noble,
   Note.]
   1. To perceive or apprehend clearly and certainly; to
      understand; to have full information of; as, to know one's
      duty.
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            O, that a man might know
            The end of this day's business ere it come! --Shak.
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            There is a certainty in the proposition, and we know
            it.                                   --Dryden.
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            Know how sublime a thing it is
            To suffer and be strong.              --Longfellow.
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   2. To be convinced of the truth of; to be fully assured of;
      as, to know things from information.
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   3. 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; as, to know an author; to know the
      rules of an organization.
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            He hath made him to be sin for us, who knew no sin.
                                                  --2 Cor. v.
                                                  21.
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            Not to know me argues yourselves unknown. --Milton.
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   4. To recognize; to distinguish; to discern the character of;
      as, to know a person's face or figure.
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            Ye shall know them by their fruits.   --Matt. vil.
                                                  16.
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            And their eyes were opened, and they knew him.
                                                  --Luke xxiv.
                                                  31.
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            To know
            Faithful friend from flattering foe.  --Shak.
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            At nearer view he thought he knew the dead.
                                                  --Flatman.
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   5. To have sexual intercourse with.
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            And Adam knew Eve his wife.           --Gen. iv. 1.
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   Note: Know is often followed by an objective and an
         infinitive (with or without to) or a participle, a
         dependent sentence, etc.
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               And I knew that thou hearest me always. --John
                                                  xi. 42.
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               The monk he instantly knew to be the prior. --Sir
                                                  W. Scott.
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               In other hands I have known money do good.
                                                  --Dickens.
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   To know how, to understand the manner, way, or means; to
      have requisite information, intelligence, or sagacity. How
      is sometimes omitted. " If we fear to die, or know not to
      be patient." --Jer. Taylor.
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