convention

US /kənˈven.ʃən/
UK /kənˈven.ʃən/
"convention" picture
1.

a large meeting or conference, especially of members of a political party or a particular profession

:
The annual sales convention will be held in Las Vegas.
Delegates from all states attended the political convention.
2.

a way in which something is usually done, especially within a particular area or activity; a custom

:
It's a long-standing convention to exchange gifts on holidays.
Breaking with convention, the artist used unconventional materials.
3.

an agreement between countries covering particular matters, especially one less formal than a treaty

:
The Geneva Convention sets out the standards of international law for humanitarian treatment.
Several countries signed the new environmental convention.