Noah Webster's Dictionary 1. (n.) The act of coming together; the state of being together; union; coalition. 2. (v. i.) General agreement or concurrence; arbitrary custom; usage; conventionality. 3. (n.) A meeting or an assembly of persons, esp. of delegates or representatives, to accomplish some specific object, -- civil, social, political, or ecclesiastical. 4. (n.) An extraordinary assembly of the parliament or estates of the realm, held without the king's writ, -- as the assembly which restored Charles II. to the throne, and that which declared the throne to be abdicated by James II. 5. (n.) An agreement or contract less formal than, or preliminary to, a treaty; an informal compact, as between commanders of armies in respect to suspension of hostilities, or between states; also, a formal agreement between governments or sovereign powers; as, a postal convention between two governments.

Multi-Version Concordance Convention (1 Occurrence) Numbers 16:2 and they rise up before Moses, with men of the sons of Israel, two hundred and fifty, princes of the company, called of the convention, men of name, (YLT)