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Noun alteration has 3 senses
change, alteration, modification - an event that occurs when something passes from one state or phase to another; "the change was intended to increase sales"; "this storm is certainly a change for the worse"; "the neighborhood had undergone few modifications since his last visit years ago"--1 is a kind of happening, occurrence, natural event
 --1 has particulars:
 |  | avulsion; mutation; sublimation; surprise; birth, nativity, nascency, nascence; separation, breakup, detachment; vagary; variation, fluctuation; conversion; death, decease; decrease, lessening, drop-off; destabilization; increase; easing, moderation, relief; deformation; transition; transformation, transmutation, shift; twinkle, scintillation, sparkling; shimmer, play; transmutation; damage, harm, impairment; development; revolution; mutation, genetic mutation, chromosomal mutation; sex change; loss of consciousness | 
alteration, modification, adjustment - the act of making something different (as e.g. the size of a garment)--2 is a kind of change
 --2 has particulars:
revision, alteration - the act of revising or altering (involving reconsideration and modification); "it would require a drastic revision of his opinion"--3 is a kind of transformation, translation
 --3 has particulars:
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