Source : Webster's Revised Unabridged Dictionary (1913)

Expedience \Ex*pe"di*ence\, Expediency \Ex*pe"di*en*cy\,, n.
   1. The quality of being expedient or advantageous; fitness or
      suitableness to effect a purpose intended; adaptedness to
      self-interest; desirableness; advantage; advisability; --
      sometimes contradistinguished from moral rectitude.

            Divine wisdom discovers no expediency in vice.
                                                  --Cogan.

            To determine concerning the expedience of action.
                                                  --Sharp.

            Much declamation may be heard in the present day
            against expediency, as if it were not the proper
            object of a deliberative assembly, and as if it were
            only pursued by the unprincipled.     --Whately.

   2. Expedition; haste; dispatch. [Obs.]

            Making hither with all due expedience. --Shak.

   3. An expedition; enterprise; adventure. [Obs.]

            Forwarding this dear expedience.      --Shak.

Source : WordNet®

expedience
     n 1: the quality of being suited to the end in view [syn: {expediency}]
          [ant: {inexpedience}, {inexpedience}]
     2: taking advantage of opportunities without regard for the
        consequences for others [syn: {opportunism}, {self-interest},
         {self-seeking}]