Pronunciation: (dek'ru-munt), [key]
1. the act or process of decreasing; gradual reduction.
2. the amount lost by reduction.
3. Math.a negative increment.
4. Physics.the ratio of amplitudes of a damped harmonic motion in the course of two successive oscillations.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.