decremental

decrement

[dek-ruh-muhnt]
noun
1.
the act or process of decreasing; gradual reduction.
2.
the amount lost by reduction.
3.
Mathematics. a negative increment.
4.
Physics. the ratio of amplitudes of a damped harmonic motion in the course of two successive oscillations.

Origin:
1475–85; < Latin dēcrēmentum, equivalent to dēcrē(tus) (see decrease) + -mentum -ment

decremental [dek-ruh-men-tl] , adjective
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World English Dictionary
decrement (ˈdɛkrɪmənt)
 
n
1.  the act of decreasing; diminution
2.  maths a negative increment
3.  physics a measure of the damping of an oscillator, expressed by the ratio of the amplitude of a cycle to its amplitude after one period
4.  (of spectra) a sequence of related spectrum lines decaying in intensity, e.g. Balmer decay
 
[C17: from Latin dēcrēmentum, from dēcrescere to decrease]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

decrement
1620s, from L. decrementum, from stem of decrescere (see decrease).
Online Etymology Dictionary, © 2010 Douglas Harper
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