addition

(noun) a component that is added to something to improve it. Synonyms: add-on, improver. Examples: "The addition of a bathroom was a major improvement." "The addition of cinnamon improved the flavor."

(noun) the act of adding one thing to another. Examples: "The addition of flowers created a pleasing effect." "The addition of a leap day every four years."

(noun) a quantity that is added. Synonyms: increase, gain. Examples: "There was an addition to property taxes this year." "They recorded the cattle's gain in weight over a period of weeks."

(noun) something added to what you already have. Synonyms: accession. Examples: "The librarian shelved the new accessions." "He was a new addition to the staff."

(noun) a suburban area laid out in streets and lots for a future residential area.

(noun) the arithmetic operation of summing; calculating the sum of two or more numbers. Synonyms: summation, plus. Examples: "The summation of four and three gives seven." "Four plus three equals seven."