/ Dictionary / Index T testamentary trust: Meaning and Definition of Find definitions for: testamen'tary trust' Pronunciation: [key] — Law. Law. a trust set up under the terms of a will. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. testamentary testate Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language