Definition of convention
b
: an agreement between states for regulation of matters affecting all of them
an international convention banning the spread of nuclear weapons
c
: a compact between opposing commanders especially concerning prisoner exchange or armistice
d
: a general agreement about basic principles or procedures
also
: a principle or procedure accepted as true or correct by convention
the conventions of grammar
2a
: the summoning or convening of an assembly
b
: an assembly of persons met for a common purpose
a comic book convention
especially
: a meeting of the delegates of a political party for the purpose of formulating a platform and selecting candidates for office
c
: the usually state or national organization of a religious denomination
3a
: usage or custom especially in social matters
conventions of society
b
: a rule of conduct or behavior
c
: a practice in bidding or playing that conveys information between partners in a card game (such as bridge)
d
: an established technique, practice, or device (as in the theater)
The usual romantic conventions made the film predictable.
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Merriam-Webster unabridged
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Time Traveler for convention
The first known use of convention was in the 15th century
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