1. To assist or help someone in a conscientious and responsible manner, fulfilling one's obligation or duty
She dutifully aided her elderly parents with their daily tasks.
Ela ajudava fielmente seus pais idosos com suas tarefas diárias.
2. To provide support or assistance in a reliable and committed way
The volunteers dutifully aided the disaster relief efforts.
Os voluntários auxiliaram diligentemente os esforços de alívio do desastre.