The Collaborative International Dictionary of English v.0.48:

Will \Will\, v. t. [imp. & p. p. Willed; p. pr. & vb. n.
   Willing. Indic. present I will, thou willeth, he wills; we,
   ye, they will.] [Cf. AS. willian. See Will, n.]
   [1913 Webster]
   1. To form a distinct volition of; to determine by an act of
      choice; to ordain; to decree. "What she will to do or
      say." --Milton.
      [1913 Webster]

            By all law and reason, that which the Parliament
            will not, is no more established in this kingdom.
                                                  --Milton.
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            Two things he [God] willeth, that we should be good,
            and that we should be happy.          --Barrow.
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   2. To enjoin or command, as that which is determined by an
      act of volition; to direct; to order. [Obs. or R.]
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            They willed me say so, madam.         --Shak.
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            Send for music,
            And will the cooks to use their best of cunning
            To please the palate.                 --Beau. & Fl.
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            As you go, will the lord mayor . . .
            To attend our further pleasure presently. --J.
                                                  Webster.
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   3. To give or direct the disposal of by testament; to
      bequeath; to devise; as, to will one's estate to a child;
      also, to order or direct by testament; as, he willed that
      his nephew should have his watch.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Willing \Will"ing\, a. [From Will, v. t.]
   [1913 Webster]
   1. Free to do or to grant; having the mind inclined; not
      opposed in mind; not choosing to refuse; disposed; not
      averse; desirous; consenting; complying; ready.
      [1913 Webster]

            Felix, willing to show the Jews a pleasure, left
            Paul bound.                           --Acts xxiv.
                                                  27.
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            With wearied wings and willing feet.  --Milton.
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            [Fruit] shaken in August from the willing boughs.
                                                  --Bryant.
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   2. Received of choice, or without reluctance; submitted to
      voluntarily; chosen; desired.
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            [They] are held, with his melodious harmony,
            In willing chains and sweet captivity. --Milton.
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   3. Spontaneous; self-moved. [R.]
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            No spouts of blood run willing from a tree.
                                                  --Dryden.
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WordNet (r) 3.0 (2006):

willing
    adj 1: disposed or inclined toward; "a willing participant";
           "willing helpers" [ant: unwilling]
    2: not brought about by coercion or force; "the confession was
       uncoerced" [syn: uncoerced, unforced, willing]
    n 1: the act of making a choice; "followed my father of my own
         volition" [syn: volition, willing]

Moby Thesaurus II by Grady Ward, 1.0:

100 Moby Thesaurus words for "willing":
   accordant, acquiescent, affirmative, agreeable, agreeing,
   alacritous, amenable, approving, apt, ardent, assenting, bright,
   clever, compliable, compliant, complying, conative, conforming,
   consentient, consenting, content, cooperative, deliberate,
   determined, devoted, disposed, docile, duteous, dutiful, eager,
   educable, endorsing, enthusiastic, experimental, facile, fain,
   fair, faithful, favorable, favorably disposed, favorably inclined,
   formable, forward, game, impressionable, in the mind, in the mood,
   inclined, instructable, intelligent, intentional, law-abiding,
   loyal, malleable, minded, moldable, motivated, nothing loath,
   obedient, open, permissive, plastic, pliable, pliant, predisposed,
   prompt, prone, quick, ratifying, ready, ready and willing,
   receptive, resolute, responsive, ripe for instruction, sanctioning,
   schoolable, submissive, susceptible, teachable, tentative,
   thirsty for knowledge, tractable, trainable, trial, unforced,
   ungrudging, unloath, unrefusing, unreluctant, venturesome,
   volitional, voluntary, well-disposed, well-inclined, willed,
   willful, willinghearted, witting, zealous