the act of augmenting; state of being augmented.
that by which anything is augmented.
Music. modification of a theme by increasing the time value of all its notes.
Heraldry. an addition to a coat of arms granted to a person by a sovereign power in recognition of a notable action.

1425–75; late Middle English (< Anglo-French) < Late Latin augmentātiōn- (stem of augmentātiō). See augment, -ation; replacing late Middle English aumentacion < Middle French Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
augmentation (ˌɔːɡmɛnˈteɪʃən)
1.  the act of augmenting or the state of being augmented
2.  the amount by which something is increased
3.  music Compare diminution the presentation of a subject of a fugue, in which the note values are uniformly increased

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-15c., "act of making greater," from O.Fr. augmentacion "increase," from L.L. augmentationem (nom. augmentatio), noun of action from augmentatus, pp. of augmentare (see augment). Meaning "amount by which something is increased" is from 1520s. Musical sense is from 1590s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The relationship of calcium, arginine, and glucose to gastric inhibitory
  polypeptide augmentation of insulin secretion.
Augmentation system means all players can play in their own style.
Pharmacotherapy augmentation strategies in treatment-resistant anxiety
But for the hardcore gamer, that pristine landscape is begging for augmentation.
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