treaty, contract, or agreement between two or more parties.

Convention is also a name given to an extraordinary assembly of parliament, or the estates of the realm, held without the king's writ; as was the convention of estates, who, upon the retreat of king James II., came to a conclusion that he had abdicated the throne, and that the right of succession devolved to king William and queen Mary; whereupon their assembly expired as a convention, and was converted into a parliament.