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alteration (n.)

late 14c., alteracioun, "change, transformation, action of altering," from Old French alteracion "change, alteration" (14c.), and directly from Medieval Latin alterationem (nominative alteratio), noun of action from past-participle stem of Late Latin alterare "to change," from Latin alter "the other (of the two)," from PIE root *al- (1) "beyond" + comparative suffix -ter (as in other). 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. Related: Alterations.

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Definitions of alteration from WordNet

alteration (n.)
an event that occurs when something passes from one state or phase to another;
Synonyms: change / modification
alteration (n.)
the act of making something different (as e.g. the size of a garment);
alteration (n.)
the act of revising or altering (involving reconsideration and modification);
Synonyms: revision
From wordnet.princeton.edu