Source : Webster's Revised Unabridged Dictionary (1913)

Disdain \Dis*dain"\, v. i.
   To be filled with scorn; to feel contemptuous anger; to be
   haughty.

         And when the chief priests and scribes saw the marvels
         that he did . . . they disdained.        --Genevan
                                                  Testament
                                                  (Matt. xxi.
                                                  15).

Disdain \Dis*dain"\ (?; 277), n. [OE. desdain, disdein, OF.
   desdein, desdaing, F. d['e]dain, fr. the verb. See {Disdain},
   v. t.]
   1. A feeling of contempt and aversion; the regarding anything
      as unworthy of or beneath one; scorn.

            How my soul is moved with just disdain! --Pope.

   Note: Often implying an idea of haughtiness.

               Disdain and scorn ride sparkling in her eyes.
                                                  --Shak.

   2. That which is worthy to be disdained or regarded with
      contempt and aversion. [Obs.]

            Most loathsome, filthy, foul, and full of vile
            disdain.                              --Spenser.

   3. The state of being despised; shame. [Obs.] --Shak.

   Syn: Haughtiness; scorn; contempt; arrogance; pride. See
        {Haughtiness}.

Disdain \Dis*dain"\ (?; 277), v. t. [imp. & p. p. {Disdained};
   p. pr. & vb. n. {Disdaining}.] [OE. disdainen, desdainen, OF.
   desdeigner, desdaigner, F. d['e]daigner; des- (L. dis-) +
   daigner to deign, fr. L. dignari to deem worthy. See
   {Deign}.]
   1. To think unworthy; to deem unsuitable or unbecoming; as,
      to disdain to do a mean act.

            Disdaining . . . that any should bear the armor of
            the best knight living.               --Sir P.
                                                  Sidney.

   2. To reject as unworthy of one's self, or as not deserving
      one's notice; to look with scorn upon; to scorn, as base
      acts, character, etc.

            When the Philistine . . . saw Dawid, he disdained
            him; for he was but a youth.          --1 Sam. xvii.
                                                  42.

            'T is great, 't manly to disdain disguise. --Young.

   Syn: To contemn; despise; scorn. See {Contemn}.

Source : WordNet®

disdain
     n 1: lack of respect accompanied by a feeling of intense dislike;
          "he was held in contempt"; "the despite in which
          outsiders were held is legendary" [syn: {contempt}, {scorn},
           {despite}]
     2: a communication that indicates lack of respect by
        patronizing the recipient [syn: {condescension}, {patronage}]
     v 1: look down on with disdain; "He despises the people he has to
          work for"; "The professor scorns the students who don't
          catch on immediately" [syn: {contemn}, {despise}, {scorn}]
     2: reject with contempt; "She spurned his advances" [syn: {reject},
         {spurn}, {freeze off}, {scorn}, {pooh-pooh}, {turn down}]