Meaning of “convention” - Learner’s Dictionary

convention

noun uk us /kənˈvenʃən/
MEETING [ C ]

a large formal meeting of people with the same interest or work:

the Democratic Party convention
CUSTOM [ C, U ]

a usual and accepted way of behaving or doing something:

In many countries it is the convention to wear black at funerals.
AGREEMENT [ C ]

a formal agreement between countries:

an international convention on human rights

(Definition of “convention” from the Cambridge Learner’s Dictionary © Cambridge University Press)