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say it: uh-DISH-uhn
addition is a noun meaning "a component that is added to something to improve it". It carries 6 recorded senses.
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”
a quantity that is added
“there was an addition to property taxes this year”
“they recorded the cattle's gain in weight over a period of weeks”
something added to what you already have
“the librarian shelved the new accessions”
“he was a new addition to the staff”
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”
“four plus three equals seven”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for addition come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.