A testator's intention that a document should function as his last will and testament, the determination of which is up to probate court. See also testator (testatrix). testamentary trust See trust. n. testator (testatrix) One who makes a will, especially one who dies and leaves a will. Because testator has come to be applied to both sexes, the use of the feminine testatrix has become obsolete. See also intestate, testacy, and testament. theocracy test case (action) See case