testamentn.[F., fr. L. testamentum, fr. testari to be a witness, to make one's last will, akin to testis a witness. Cf. Intestate, Testify.]1. (Law) A solemn, authentic instrument in writing, by which a person declares his will as to disposal of his estate and effects after his death.()()2. One of the two distinct revelations of God's purposes toward man; a covenant; also, one of the two general divisions of the canonical books of the sacred Scriptures, in which the covenants are respectively revealed; as, the Old Testament; the New Testament; -- often limited, in colloquial language, to the latter.()He is the mediator of the new testament . . . for the redemption of the transgressions that were under the first testament. (Heb. ix. 15.)Holographic testament, a testament written wholly by the testator himself. Bouvier.()