definition of
alteration

[1] #1 alteration n. [change, 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". wn

[2] #2 alteration n. [modification, adjustment] the act of making something different (as e.g. the size of a garment). wn

[3] #3 alteration n. [revision] the act of revising or altering (involving reconsideration and modification); "it would require a drastic revision of his opinion". wn