What does "Ab initio" mean in legal terms?

"Ab initio" is a Latin term that translates to "from the beginning." In legal contexts, this phrase is often used to denote that a situation, condition, or legal effect was in place from the outset of a matter, rather than being applied retroactively or having an effect only from a certain point onward. When something is declared "ab initio," it means that it is considered to have been valid at the very start of the situation in question.

For example, if a contract is found to be void ab initio, it implies that the contract was never valid from its inception, as opposed to becoming invalid at some later time. This concept helps clarify legal standings and rights that are based on the original circumstances of a case, ensuring that the foundational aspects of legal matters are understood and evaluated accurately.