#1 modification n. [alteration, adjustment] the act of making something different (as e.g. the size of a garment). wn
#2 modification n. slightly modified copy; not an exact copy; "a modification of last year's model". wn
#3 modification n. [qualifying, limiting] the grammatical relation that exists when a word qualifies the meaning of the phrase. wn
#4 modification n. [change, alteration] 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
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