addition meaning and definition

ADDITION noun

Definition of addition (noun)

1. a component that is added to something to improve it
   • "the addition of a bathroom was a major improvement"; "the addition of cinnamon improved the flavor"
   • synonyms: add-on, improver
2. 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"
   • antonym: deduction
3. 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"
   • synonyms: gain, increase
4. something added to what you already have
   • "the librarian shelved the new accessions"; "he was a new addition to the staff"
   • synonyms: accession
5. a suburban area laid out in streets and lots for a future residential area
6. 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"
   • synonyms: plus, summation