alteration in WordNet English dictionary

1. the act of making something different (as e.g. the size of a garment)
   alteration  modification  adjustment 
   
2. the act of revising or altering (involving reconsideration and modification)
   "it would require a drastic revision of his opinion"
   revision  alteration 
   
3. 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"
   change  alteration  modification