addition
noun.
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
Synonym: add-on, improver
noun.
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
noun.
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
Synonym: gain, increase
noun.
something added to what you already have
the librarian shelved the new accessions|he was a new addition to the staff
Synonym: accession
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
the summation of four and three gives seven|four plus three equals seven
Synonym: plus, summation
Antonym: subtraction