conventioncon·ven·tion /kənˈvenʃən/ noun1[countableC, uncountableU] behaviour and attitudes that most people in a society believe to be normal and right 2[countableC] a formal agreement, especially between countries, about rules for an activity such as war or tradeThe Berne convention requires its signatories to respect copyrights for the life of the author plus 50 years.
3[countableC]COMMERCE a large meeting of people who belong to the same profession or organization, or work in the same industryBusiness was so bad that many dealers decided not to go to that year’s National Automobile Dealers Association convention.