Source : Webster's Revised Unabridged Dictionary (1913)

Disengagement \Dis`en*gage"ment\, n. [Pref. dis- + engagement:
   cf. F. d['e]sengagement.]
   1. The act of disengaging or setting free, or the state of
      being disengaged.

            It is easy to render this disengagement of caloric
            and light evident to the senses.      --Transl. of
                                                  Lavoisier.

            A disengagement from earthly trammels. --Sir W.
                                                  Jones.

   2. Freedom from engrossing occupation; leisure.

            Disengagement is absolutely necessary to enjoyment.
                                                  --Bp. Butler.

Source : WordNet®

disengagement
     n 1: the act of releasing from an attachment or connection [syn:
          {detachment}]
     2: to break off a military action with an enemy [syn: {fallback},
         {pullout}]