1. An introductory statement or section, especially one that explains the purpose or principles of a document
The preamble of the Constitution outlines the founding principles.
O preâmbulo da Constituição descreve os princípios fundamentais.
2. A preliminary or introductory event, fact, or circumstance
The tense meeting was a preamble to the major announcement.
A reunião tensa foi um preâmbulo para o grande anúncio.