[noun] [C] - a written agreement between two or more countries formally approved and signed by their leadersa peace treatyThe treaty on European union calls for the creation of a single currency by 1999.We've signed/concluded a treaty with neighbouring states to limit emissions of harmful gases. [+ to infinitive]The treaty must be ratified (= approved and signed) by all member governments before it can take effect.
Meaning of TREATY in English
Cambridge English vocab. Кембриджский английский словарь. 2012