1. A statement or declaration made without premeditation, planning, or external prompting; an utterance arising naturally and unreservedly from one's thoughts or feelings
Her spontaneous assertion about the project's success boosted the team's morale.
Sua afirmação espontânea sobre o sucesso do projeto elevou o moral da equipe.
2. In legal contexts, a voluntary statement made by a person without being prompted by questioning or coercion
The witness's spontaneous assertion was admissible as evidence in court.
A afirmação espontânea da testemunha foi admitida como prova em tribunal.