Source : Webster's Revised Unabridged Dictionary (1913)

Disjoin \Dis*join"\, v. i.
   To become separated; to part.

Disjoin \Dis*join"\, v. t. [imp. & p. p. {Disjoined}; p. pr. &
   vb. n. {Disjoining}.] [OF. desjoindre, F. disjoindre,
   d['e]joindre, fr. L. disjungere; dis- + jungere to join. See
   {Join}, and cf. {Disjoint}, {Disjunct}.]
   To part; to disunite; to separate; to sunder.

         That marriage, therefore, God himself disjoins.
                                                  --Milton.

         Never let us lay down our arms against France, till we
         have utterly disjoined her from the Spanish monarchy.
                                                  --Addison.

         Windmill Street consisted of disjoined houses.
                                                  --Pennant.

   Syn: To disunite; separate; detach; sever; dissever; sunder;
        disconnect.

Source : WordNet®

disjoin
     v 1: make disjoint, separated, or disconnected; undo the joining
          of [syn: {disjoint}] [ant: {join}]
     2: become separated, disconnected or disjoint [syn: {disjoint}]
        [ant: {join}]