1. To show or express enthusiastic and energetic commitment to a cause, task, or belief
The volunteers demonstrated zeal in their efforts to clean up the community.
Os voluntários demonstraram zelo nos seus esforços para limpar a comunidade.
2. To exhibit fervent dedication or passionate eagerness in pursuit of a goal
She demonstrated zeal in her pursuit of justice for the underrepresented.
Ela demonstrou zelo na sua luta por justiça para os sub-representados.