Synonyms for Alteration (same or very similar meaning)
WordNet sense 1 (an event that occurs when something passes from one state or phase to another):
change, modificationWordNet sense 2 (the act of revising or altering (involving reconsideration and modification)):
revisionWordNet sense 3 (the act of making something different (as e.g. the size of a garment)):
adjustmentFrom the ODE community, based on WordNetadd/edit