convention
/kən-ˈven(t)-shən/
noun
agreement, contract
an agreement between states for regulation of matters affecting all of them
a compact between opposing commanders especially concerning prisoner exchange or armistice
an international convention banning the spread of nuclear weapons
noun
a building or set of buildings designed to hold many people and used for meetings
The conference was held at the new convention center.
noun
one of a series of agreements concerning the treatment of prisoners of war and of the sick, wounded, and dead in battle first made at Geneva, Switzerland in 1864 and subsequently accepted in later revisions by most nations