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gradation

[grey-dey-shuh n] /greɪˈdeɪ ʃən/
noun
1.
any process or change taking place through a series of stages, by degrees, or in a gradual manner.
2.
a stage, degree, or grade in such a series.
3.
the passing of one tint or shade of color to another, or one surface to another, by very small degrees, as in painting or sculpture.
4.
the act of grading.
5.
6.
Geology. the leveling of a land surface, resulting from the concerted action of erosion and deposition.
Origin
1530-1540
1530-40; < Latin gradātiōn- (stem of gradātiō). See grade, -ation
Related forms
gradational, adjective
gradationally, adverb
regradation, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for regradation

gradation

/ɡrəˈdeɪʃən/
noun
1.
a series of systematic stages; gradual progression
2.
(often pl) a stage or degree in such a series or progression
3.
the act or process of arranging or forming in stages, grades, etc, or of progressing evenly
4.
(in painting, drawing, or sculpture) transition from one colour, tone, or surface to another through a series of very slight changes
5.
(linguistics) any change in the quality or length of a vowel within a word indicating certain distinctions, such as inflectional or tense differentiations See ablaut
6.
(geology) the natural levelling of land as a result of the building up or wearing down of pre-existing formations
Derived Forms
gradational, adjective
gradationally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for regradation

gradation

n.

1530s, "climax," from Middle French gradation (16c.) and directly from Latin gradationem (nominative gradatio) "ascent by steps, a climax," noun of action from gradus "step, degree" (see grade). Meaning "gradual change" is from 1540s. Related: Gradational.

Online Etymology Dictionary, © 2010 Douglas Harper
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regradation in Science
gradation
  (grā-dā'shən)   
  1. The process by which land is leveled off through erosion or the transportation or deposition of sediments, especially the process by which a riverbed is brought to a level where it is just able to transport the amount of sediment delivered to it.

  2. The proportion of particles (such as sand grains) of a given size within a sample of particulate material, such as soil or sandstone.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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