tratado

noun
  1. A formal agreement between two or more sovereign states, often used to establish peace, alliances, or trade agreements. noun
    The countries signed a tratado to ensure mutual cooperation and peace.
    The tratado was hailed as a significant step towards regional stability.
  2. A written work dealing formally and systematically with a subject, often used in academic or scholarly contexts. noun
    She published a tratado on the philosophical implications of artificial intelligence.
    His tratado on medieval architecture is considered a seminal work in the field.