a. [ L. testamentarius: cf. F. testamentaire. ] 1. Of or pertaining to a will, or testament; as, letters testamentary. [ 1913 Webster ] 2. Bequeathed by will; given by testament. [ 1913 Webster ] How many testamentary charities have been defeated by the negligence or fraud of executors! Atterbury. [ 1913 Webster ] 3. Done, appointed by, or founded on, a testament, or will; as, a testamentary guardian of a minor, who may be appointed by the will of a father to act in that capacity until the child becomes of age. [ 1913 Webster ] | 