Which of the following terms indicates a gradual reduction in volume or intensity?

The term that indicates a gradual reduction in volume or intensity is "perdendosi." In musical terminology, "perdendosi" is an Italian word that translates to "dying away." It suggests a gradual decrease not only in dynamics but often also in tempo, leading to a soft and gentle ending to a passage. This is often used to create a specific atmospheric effect, allowing the music to fade and evoke a feeling of tranquility or finality.

While "meno" indicates a lesser degree or reduction (for example, "meno forte" means less loud), it does not specifically imply a gradual fading. "Schwungvoll," which means lively or spirited, and "stretto," indicating a faster tempo or a tighter structure, do not relate to volume or intensity reduction. Thus, "perdendosi" stands out as the appropriate term for conveying the idea of gradually diminishing sound.