convention

noun

1. 1

   A meeting or gathering.

   “The convention was held in Geneva.”

2. 2

   A formal deliberative assembly of mandated delegates.

   “The EU installed an inter-institutional Convention to draft a European constitution.”

3. 3

   The convening of a formal meeting.

4. 4

   A formal agreement, contract or pact.

5. 5

   A treaty or supplement to such.

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

6. 6

   A practice or procedure widely observed in a group, especially to facilitate social interaction; a custom.

   “Table seatings are generally determined by tacit convention, not binding formal protocol.”