1. In music, a theme or melodic idea that a composer or performer chooses to develop or present willingly, often as opposed to a required or assigned theme
The composer explored a voluntary theme throughout the entire sonata movement.
O compositor explorou um tema voluntário ao longo de todo o movimento da sonata.
2. In academic or organizational contexts, a topic chosen by an individual based on personal interest rather than external requirement
Students were asked to select a voluntary theme for their research project.
Pediu-se aos alunos que selecionassem um tema voluntário para seu projeto de pesquisa.