Official written agreements between countries or groups, usually dealing with peace, trade, or other important matters.
From Old French 'traité,' derived from Latin 'tractatus' meaning something handled or discussed, from 'tractare' (to handle). The word originally meant any discussion, then became specific to formal agreements.
Some treaties are so famous they changed history—the Treaty of Versailles after World War I was so harsh it actually helped cause World War II, showing how the words in a formal agreement can echo through decades and affect millions of lives.
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