addition

something added to what you already have

“he was a new addition to the staff”

a component that is added to something to improve it

“the addition of a bathroom was a major improvement”

a quantity that is added

“there was an addition to property taxes this year”

the arithmetic operation of summing; calculating the sum of two or more numbers

a suburban area laid out in streets and lots for a future residential area

the act of adding one thing to another

“the addition of flowers created a pleasing effect”