Also means
treatise
Usage Note
Tratado can be a diplomatic agreement between states (Tratado de Roma) or a scholarly written work on a subject (un tratado de filosofía). Context distinguishes the two senses. It is also the past participle of tratar ('to treat'), so bien tratado means 'well treated'. The plural is regular: tratados.
Examples
"Los países firmaron un tratado de paz."
Natural Translation
The countries signed a peace treaty.

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