Source : Webster's Revised Unabridged Dictionary (1913)

Dishonor \Dis*hon"or\ (d[i^]s*[o^]n"[~e]r or d[i^]z-), n. [OE.
   deshonour, dishonour, OF. deshonor, deshonur, F.
   d['e]shonneur; pref. des- (L. dis-) + honor, honur, F.
   honneur, fr. L. honor. See {Honor}.] [Written also
   {dishonour}.]
   1. Lack of honor; disgrace; ignominy; shame; reproach.

            It was not meet for us to see the king's dishonor.
                                                  --Ezra iv. 14.

            His honor rooted in dishonor stood.   --Tennyson.

   2. (Law) The nonpayment or nonacceptance of commercial paper
      by the party on whom it is drawn.

   Syn: Disgrace; ignominy; shame; censure; reproach;
        opprobrium.

Dishonor \Dis*hon"or\, v. t. [imp. & p. p. {Dishonored}; p. pr.
   & vb. n. {Dishonoring}.] [OE. deshonouren, F. d['e]shonorer;
   pref. d['e]s- (L. dis-) + honorer to honor, fr. L. honorare.
   See {Honor}, v. t.] [Written also {dishonour}.]
   1. To deprive of honor; to disgrace; to bring reproach or
      shame on; to treat with indignity, or as unworthy in the
      sight of others; to stain the character of; to lessen the
      reputation of; as, the duelist dishonors himself to
      maintain his honor.

            Nothing . . . that may dishonor Our law, or stain my
            vow of Nazarite.                      --Milton.

   2. To violate the chastity of; to debauch. --Dryden.

   3. To refuse or decline to accept or pay; -- said of a bill,
      check, note, or draft which is due or presented; as, to
      dishonor a bill exchange.

   Syn: To disgrace; shame; debase; degrade; lower; humble;
        humiliate; debauch; pollute.

Source : WordNet®

dishonour
     n 1: a state of shame or disgrace; "he was resigned to a life of
          dishonor" [syn: {dishonor}] [ant: {honor}]
     2: lacking honor or integrity [syn: {dishonor}] [ant: {honor}]
     v 1: bring shame or dishonor upon; "he dishonored his family by
          committing a serious crime" [syn: {dishonor}, {disgrace},
           {attaint}, {shame}] [ant: {honor}]
     2: force (someone) to have sex against their will; "The woman
        was raped on her way home at night" [syn: {rape}, {ravish},
         {violate}, {assault}, {dishonor}, {outrage}]
     3: refuse to accept; "dishonor checks and drafts" [syn: {dishonor}]
        [ant: {honor}]