convention

noun6

1. •
   A meeting or gathering.

   • The convention was held in Geneva.
2. •
   A formal deliberative assembly of mandated delegates.

   • The EU installed an inter-institutional Convention to draft a European constitution.
3. •
   The convening of a formal meeting.
4. •
   a way of doing something that most people in a group follow without being told

   • Table seatings are generally determined by tacit convention, not binding formal protocol.
   • The convention of driving on the right is reinforced by law.
5. •
   A formal agreement, contract, rule, or pact.
6. •
   A treaty or supplement to such.

   • The Vienna convention at the Vienna Congress (1814-15) standardized most of diplomatic conduct for generations.