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

[ Syn: add-on , improver ]

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 cattles gain in weight over a period of weeks

[ Syn: increase , gain ]

something added to what you already have; the librarian shelved the new accessions; he was a new addition to the staff

[ Syn: accession ]

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

[ Syn: summation , plus ]