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Ab initio (ab init)
From the beginning (Latin). If a term or condition of a contract was illegal or invalid when it was signed, then the contract was void 'ab initio'.Agent
In contract law, a person or organisation appointed to act on behalf of another person or organisation, known as the principal. The level of the agent's authority to deal is subject to agreement between the principal and the agent. However, unless told otherwise, third parties can assume that the agent has full powers to deal.

