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su·per·ad·di·tion | \ ˌsü-pər-ə-ˈdi-shən 
, -a-ˈdi- \
, -a-ˈdi- \ plural superadditions
Definition of superaddition
: the act or process of superadding something
… he saw that it was a long quadrangular structure of brick … with the ornamental superaddition of an octagonal tower …— Joseph Holt Ingraham There may be certain states existing which are highly favourable to the propagation of disease, yet until the superaddition of some other element entering into the causation, the specific poison might not come into full operation …— John Richard Wardell
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Time Traveler for superaddition
The first known use of superaddition was in 1610
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