Source : Webster's Revised Unabridged Dictionary (1913)

Executory \Ex*ec"u*to*ry\, a. [LL. executorius, L. exsecutorius:
   cf.F. ex['e]cutoire.]
   1. Pertaining to administration, or putting the laws in
      force; executive.

            The official and executory duties of government.
                                                  --Burke.

   2. (Law) Designed to be executed or carried into effect in
      time to come, or to take effect on a future contingency;
      as, an executory devise, reminder, or estate; an executory
      contract. --Blackstone.