the act or process of altering; the state of being altered: Alteration will improve the dress.
a change; modification or adjustment: There has been an alteration in our plans.

1350–1400; Middle English alteracioun < Medieval Latin alterātiōn- (stem of alterātiō). See alter, -ation

prealteration, noun
proalteration, adjective
realteration, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alteration (ˌɔːltəˈreɪʃən)
1.  an adjustment, change, or modification
2.  the act of altering or state of being altered

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

late 15c., "action of altering," from Fr. altération (14c.), from M.L. alterationem, from alterare (see alter). Meaning "change in character or appearance" is from 1530s; that of "change in ready-made clothes to suit a customer's specifications" is from 1901
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Following them prevents expensive typesetting errors and charges for excessive
  alterations to proof.
Drivers began making camping alterations to cars almost as soon as they were
And for the altered category, what's been altered even the smallest alterations
  will show.
We're not wrong to work these beautiful words onto their coins, though: they
  were the engineers of the alterations.
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