#addition the act of adding one thing to another; "the addition of flowers created a pleasing effect"; "the addition of a leap day every four years"
exclusion: #subtraction
supertype: #step-up__increase the act of increasing something; "he gave me an increase in salary"
subtype: #retrofit the act of adding a component or accessory to something that did not have it when it was manufactured; "the court ordered a retrofit on all automobiles"
subtype: #fluoridation__fluoridization__fluoridisation the addition of a fluoride to the water supply (to prevent dental decay)
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