Ab Initio
Literal meaning: “From the beginning”
What does the Latin term "Ab Initio" mean in law?
Ab initio refers to something that is deemed to have been the case from the very start, rather than from the date a court or party declares it so. When a contract or act is declared void ab initio, it is treated as though it never had legal force at any point. This concept is critical in distinguishing between void and voidable transactions: a void contract is void ab initio, while a voidable contract is valid until rescinded. The doctrine appears frequently in insurance law, where a policy procured by fraud may be rescinded ab initio, and in constitutional law, where an unconstitutional statute is treated as void ab initio. Courts also apply the concept in trespass law, where a person who enters property lawfully but then abuses that right may be deemed a trespasser ab initio under the doctrine established in the Six Carpenters' Case.
Source: General · Legal Latin
Legal Definition
Ab initio refers to something that is deemed to have been the case from the very start, rather than from the date a court or party declares it so. When a contract or act is declared void ab initio, it is treated as though it never had legal force at any point. This concept is critical in distinguishing between void and voidable transactions: a void contract is void ab initio, while a voidable contract is valid until rescinded. The doctrine appears frequently in insurance law, where a policy procured by fraud may be rescinded ab initio, and in constitutional law, where an unconstitutional statute is treated as void ab initio. Courts also apply the concept in trespass law, where a person who enters property lawfully but then abuses that right may be deemed a trespasser ab initio under the doctrine established in the Six Carpenters' Case.
How It's Used
Courts invoke ab initio when they need to establish that a legal nullity extends backward to the moment of creation rather than merely from the point of judicial declaration. Practitioners encounter this term most frequently in motions to void contracts, vacate marriages, or rescind insurance policies on grounds of fraud or illegality.
Example Sentences
The court held the insurance policy void ab initio because the applicant had materially misrepresented her medical history on the application.
Because the statute violated the First Amendment, the court declared it unconstitutional and void ab initio, rendering all prosecutions under it invalid.
The fraudulent incorporation was deemed a nullity ab initio, meaning the purported corporation never legally existed.