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addition has 7 distinct synonyms spread across 4 of its 6 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is subtraction.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a component that is added to something to improve it
“the addition of a bathroom was a major improvement”
the act of adding one thing to another
“the addition of flowers created a pleasing effect”
a quantity that is added
“there was an addition to property taxes this year”
something added to what you already have
“the librarian shelved the new accessions”
a suburban area laid out in streets and lots for a future residential area
the arithmetic operation of summing; calculating the sum of two or more numbers
“the summation of four and three gives seven”
Synonyms, antonyms and the broader and narrower relations for addition come from Princeton University’s WordNet. Full sources and licences.