will contest

will contest n. a lawsuit challenging the validity of a will and/or its terms. Bases for contesting a will include the competency of the maker of the will (testator) at the time the will was signed, the "undue influence" of someone who used pressure to force the testator to give him/her substantial gifts in the will, the existence of another will or trust, challenging illegal terms or technical faults in the execution of the will, such as not having been validly witnessed. A trial of the will contest must be held before the will can be probated, since if the will is invalid, it cannot be probated. (See: will, probate, in terrorem clause)