late 14c., "action of adding numbers;" c. 1400, "that which is added," from Old French adition "increase, augmentation" (13c.), from Latin additionem (nominative additio) "an adding to, addition," noun of action from past-participle stem of addere "add to, join, attach" (see add). Phrase in addition to "also" is from 1680s.
the addition of cinnamon improved the flavor
the addition of a bathroom was a major improvement
the addition of flowers created a pleasing effect
the addition of a leap day every four years
there was an addition to property taxes this year
he was a new addition to the staff
addict
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