Latin. “from the beginning” Examples: “A contract without consideration is invalid ab initio.” “A bigamous marriage is void ab initio.” Related entries Flagrante Delicto Retractus Feudalis Retractus Aquae Et Al. Fractura Navium Suo Motu Appeal in Forma Pauperis In Forma Pauperis Nolo Contendere In Haec Verba
