#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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