Diminuendo (noun)

1. A gradual decrease in volume or intensity of a sound.
2. A gradual decrease in loudness or intensity in a piece of music.

Origin:

From italian diminuendo, from diminuire to diminish, from latin diminuere, from di- + minuere to reduce.

Examples:

1. The pianist executed the diminuendo flawlessly.
2. The diminuendo in the music added a sense of tension to the scene.
3. The singer's diminuendo on the final note was particularly moving.
4. The diminuendo in the symphony was used to express a sense of sadness.
5. The diminuendo in the song added a sense of dramatic effect.