The act, process, or an instance of diminishing or being diminished; a reduction. The company faced a diminution in profits due to increased competition.
The amount by which something is diminished; a decrease or reduction in quantity, size, or importance. The survey recorded a diminution of nearly five percent in household income.
In music, the shortening of the time values of the notes of a melody. The composer used diminution to create a faster-paced section in the symphony.