modification

(noun) the act of making something different (as e.g. the size of a garment). Synonyms: alteration, adjustment.

(noun) slightly modified copy; not an exact copy. Example: "A modification of last year's model."

(noun) the grammatical relation that exists when a word qualifies the meaning of the phrase. Synonyms: qualifying, limiting.

(noun) an event that occurs when something passes from one state or phase to another. Synonyms: change, alteration. Examples: "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."