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addition (n.)

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.

Origin and meaning of addition

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Definitions of addition

addition (n.)
a component that is added to something to improve it;
the addition of cinnamon improved the flavor
the addition of a bathroom was a major improvement
Synonyms: add-on / improver
addition (n.)
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
addition (n.)
a quantity that is added;
there was an addition to property taxes this year
Synonyms: increase / gain
addition (n.)
something added to what you already have;
he was a new addition to the staff
Synonyms: accession
addition (n.)
a suburban area laid out in streets and lots for a future residential area;
addition (n.)
the arithmetic operation of summing; calculating the sum of two or more numbers;
Synonyms: summation / plus
From wordnet.princeton.edu