1. The act of decreasing or reducing something
   "The diminution in production helped conserve resources";
   - decrease, reduction, step-down
    
2. Change toward something smaller or lower
   "The diminution in birth rates has led to an aging population";
   - decline
    
3. The statement of a theme in notes of lesser duration (usually half the length of the original)
   "The diminution of the main theme added a sense of urgency to the piece"

Derived forms: diminutions

Type of: change of magnitude, decrease, decrement, statement

Antonym: augmentation

Encyclopedia: Diminution