alteration

noun

1. 1

   the act of making something different (as e.g. the size of a garment)

2. 2

   the act of revising or altering (involving reconsideration and modification)

   it would require a drastic revision of his opinion

3. 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