1. A formal statement or disclosure made willingly and without coercion, often used in legal, administrative, or customs contexts
The customs official asked for a voluntary declaration of all goods being imported.
O oficial da alfândega pediu uma declaração voluntária de todas as mercadorias sendo importadas.
2. A statement given of one's own accord, without being legally required or compelled to do so
The witness provided a voluntary declaration to the police.
A testemunha forneceu uma declaração voluntária à polícia.