a meeting or formal assembly, as of representatives or delegates, for discussion of and action on particular matters of common concern.

U.S. Politics . a representative party assembly to nominate candidates and adopt platforms and party rules.

an agreement, compact, or contract.

an international agreement, esp. one dealing with a specific matter, as postal service or copyright.

a rule, method, or practice established by usage; custom

the convention of showing north at the top of a map.

general agreement or consent; accepted usage, esp. as a standard of procedure.

conventionalism.

Bridge . any of a variety of established systems or methods of bidding or playing that allows partners to convey certain information about their hands.

noun

strangeness , disagreement , discord

noun

assemblage , assembly , clambake , confab , congress , convocation , council , delegates , delegation , get together , meet * , meeting , members , powwow * , rally , representatives , show , canon , code , covenance , custom , etiquette , fashion , form , formality , habit , law , percept , precept , propriety , rule , understanding , usage , bargain , bond , compact , concord , concordat , contract , covenant , pact , protocol , stipulation , transaction , treaty , conference , body , company , conclave , congregation , crowd , gathering , group , muster , troop , accord , agreement , caucus , conventionality , diet , practice , synod , tradition