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Any of a set of numbers to be added.
[Short for addendum.]
(Mathematics) any of a set of numbers that is to be added. Compare sum11
[C20: short for addendum]
ad•dend(ˈæd ɛnd, əˈdɛnd)
any of a group of numbers or terms added together to form a sum.
[1905–10; shortening of addendum]
A number that is added to another number.