The Collaborative International Dictionary of English v.0.48:
Leave \Leave\, v. t. [imp. & p. p. Left (l[e^]ft); p. pr. &
   vb. n. Leaving.] [OE. leven, AS. l?fan, fr. l[=a]f remnant,
   heritage; akin to lifian, libban, to live, orig., to remain;
   cf. bel[imac]fan to remain, G. bleiben, Goth. bileiban.
   [root]119. See Live, v.]
   1. To withdraw one's self from; to go away from; to depart
      from; as, to leave the house.
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            Therefore shall a man leave his father and his
            mother, and shall cleave unto his wife. --Gen. ii.
                                                  24.
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   2. To let remain unremoved or undone; to let stay or
      continue, in distinction from what is removed or changed.
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            If grape gatherers come to thee, would they not
            leave some gleaning grapes ?          --Jer. xlix.
                                                  9.
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            These ought ye to have done, and not to leave the
            other undone.                         --Matt. xxiii.
                                                  23.
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            Besides it leaveth a suspicion, as if more might be
            said than is expressed.               --Bacon.
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   3. To cease from; to desist from; to abstain from.
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            Now leave complaining and begin your tea. --Pope.
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   4. To desert; to abandon; to forsake; hence, to give up; to
      relinquish.
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            Lo, we have left all, and have followed thee. --Mark
                                                  x. 28.
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            The heresies that men do leave.       --Shak.
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   5. To let be or do without interference; as, I left him to
      his reflections; I leave my hearers to judge.
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            I will leave you now to your gossiplike humor.
                                                  --Shak.
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   6. To put; to place; to deposit; to deliver; to commit; to
      submit -- with a sense of withdrawing one's self from; as,
      leave your hat in the hall; we left our cards; to leave
      the matter to arbitrators.
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            Leave there thy gift before the altar and go thy
            way.                                  --Matt. v. 24.
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            The foot
            That leaves the print of blood where'er it walks.
                                                  --Shak.
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   7. To have remaining at death; hence, to bequeath; as, he
      left a large estate; he left a good name; he left a legacy
      to his niece.
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   8. to cause to be; -- followed by an adjective or adverb
      describing a state or condition; as, the losses due to
      fire leave me penniless; The cost of defending himself
      left Bill Clinton with a mountain of lawyers' bills.
      [WordNet 1.5]
   To leave alone.
      (a) To leave in solitude.
      (b) To desist or refrain from having to do with; as, to
          leave dangerous chemicals alone.
   To leave off.
      (a) To desist from; to forbear; to stop; as, to leave off
          work at six o'clock.
      (b) To cease wearing or using; to omit to put in the usual
          position; as, to leave off a garment; to leave off the
          tablecloth.
      (c) To forsake; as, to leave off a bad habit.
   To leave out, to omit; as, to leave out a word or name in
      writing.
   To leave to one's self, to let (one) be alone; to cease
      caring for (one).
   Syn: Syn>- To quit; depart from; forsake; abandon;
        relinquish; deliver; bequeath; give up; forego; resign;
        surrender; forbear. See Quit.
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The Collaborative International Dictionary of English v.0.48:
Alone \A*lone"\, a. [All + one. OE. al one all allone, AS. [=a]n
   one, alone. See All, One, Lone.]
   1. Quite by one's self; apart from, or exclusive of, others;
      single; solitary; -- applied to a person or thing.
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            Alone on a wide, wide sea.            --Coleridge.
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            It is not good that the man should be alone. --Gen.
                                                  ii. 18.
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   2. Of or by itself; by themselves; without any thing more or
      any one else; without a sharer; only.
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            Man shall not live by bread alone.    --Luke iv. 4.
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            The citizens alone should be at the expense.
                                                  --Franklin.
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   3. Sole; only; exclusive. [R.]
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            God, by whose alone power and conversation we all
            live, and move, and have our being.   --Bentley.
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   4. Hence; Unique; rare; matchless. --Shak.
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   Note: The adjective alone commonly follows its noun.
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   To let alone or To leave alone, to abstain from
      interfering with or molesting; to suffer to remain in its
      present state.
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