Definition of Executory
That which is yet to be executed or performed; that which remains to be carried into operation or effect; incomplete; depending upon a future performance or event. The opposite of executed.
As to executory Bequests; Contracts; Devise; Estates; Remainder; Trust, and Use, see those titles.
That's the definition of Executory in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.