al·ter·a·tion

[awl-tuh-rey-shuhn]
noun
1.
the act or process of altering; the state of being altered: Alteration will improve the dress.
2.
a change; modification or adjustment: There has been an alteration in our plans.

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

pre·al·ter·a·tion, noun
pro·al·ter·a·tion, adjective
re·al·ter·a·tion, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
alteration (ˌɔːltəˈreɪʃən) [Click for IPA pronunciation guide]
 
n
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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00:10
Alteration is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

alteration
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
Alteration cannot change material content of the photo.
Pollution and alteration of tidal flows are another problem.
We use data encryption technology to help protect against loss, misuse or
  alteration of your credit card information.
The implementation-the day the alteration went live to millions of people-would
  be its first real-world test.
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