alteration, modification, adjustment -- (the act of making something different (as e.g. the size of a garment))
modification -- (slightly modified copy; not an exact copy; "a modification of last year's model")
modification, qualifying, limiting -- (the grammatical relation that exists when a word qualifies the meaning of the phrase)
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")