In the law of property, a pretermitted heir is a person who would likely stand to inherit under a will, except that the testator (the person who wrote the will) did not include the person in the testator's will. Omission may occur because the testator did not know of the omitted person at the time the will was written.
A will may contain a clause that explicitly disinherits any heirs unknown at the time that the will is executed, or any heirs not named in the will. While such a clause will not necessarily prevent a claim against an estate by a pretermitted heir, it may make it more difficult to succeed in such an action.
Pretermitted child
One common category of pretermitted heir is the pretermitted child, born after the writing of the will. Claims may also potentially be brought by children born outside of the decedent's marital relationship.
Like a pretermitted child, a pretermitted spouse may be explicitly disinherited in the will, or may be excluded from taking under the will if they received an advancement on their inheritance in anticipation of the marriage. A pretermitted spouse may also disclaim any interest in the testator's estate through an antenuptial or prenuptial agreement.