1. A statement or announcement made freely and without prior planning or external pressure
Her spontaneous declaration of love surprised everyone at the party.
Sua declaração espontânea de amor surpreendeu a todos na festa.
2. In legal contexts, a voluntary statement made by a person without being prompted or coerced
The witness's spontaneous declaration was admissible as evidence in court.
A declaração espontânea da testemunha foi admissível como prova em tribunal.