The Collaborative International Dictionary of English v.0.48:

Leave \Leave\, v. i. [imp. & p. p. Leaved; p. pr. & vb. n.
   Leaving]
   To send out leaves; to leaf; -- often with out. --G.
   Fletcher.
   [1913 Webster]

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.
      [1913 Webster]

            Therefore shall a man leave his father and his
            mother, and shall cleave unto his wife. --Gen. ii.
                                                  24.
      [1913 Webster]

   2. To let remain unremoved or undone; to let stay or
      continue, in distinction from what is removed or changed.
      [1913 Webster]

            If grape gatherers come to thee, would they not
            leave some gleaning grapes ?          --Jer. xlix.
                                                  9.
      [1913 Webster]

            These ought ye to have done, and not to leave the
            other undone.                         --Matt. xxiii.
                                                  23.
      [1913 Webster]

            Besides it leaveth a suspicion, as if more might be
            said than is expressed.               --Bacon.
      [1913 Webster]

   3. To cease from; to desist from; to abstain from.
      [1913 Webster]

            Now leave complaining and begin your tea. --Pope.
      [1913 Webster]

   4. To desert; to abandon; to forsake; hence, to give up; to
      relinquish.
      [1913 Webster]

            Lo, we have left all, and have followed thee. --Mark
                                                  x. 28.
      [1913 Webster]

            The heresies that men do leave.       --Shak.
      [1913 Webster]

   5. To let be or do without interference; as, I left him to
      his reflections; I leave my hearers to judge.
      [1913 Webster]

            I will leave you now to your gossiplike humor.
                                                  --Shak.
      [1913 Webster]

   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.
      [1913 Webster]

            Leave there thy gift before the altar and go thy
            way.                                  --Matt. v. 24.
      [1913 Webster]

            The foot
            That leaves the print of blood where'er it walks.
                                                  --Shak.
      [1913 Webster]

   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.
      [1913 Webster]

   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.
        [1913 Webster]

WordNet (r) 3.0 (2006):

leaving
    n 1: the act of departing [syn: departure, going, going
         away, leaving]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "leaving":
   AWOL, French leave, abandonment, abscondence, absence,
   absence without leave, absentation, absenteeism, absenting,
   casting away, cessation, cut, day off, decampment, default,
   departure, desuetude, disappearance, disuse, egress, escape,
   evacuation, excused absence, exit, exodus, fleeing, flight,
   forsaking, furlough, getaway, going, hegira, holiday, hooky,
   jettison, jettisoning, leave, leave of absence, nonappearance,
   nonattendance, parting, passing, pulling out, removal, retirement,
   retreat, running away, sabbatical leave, sick leave,
   throwing overboard, truancy, truantism, unexcused absence,
   vacation, walkout, withdrawal