Definition of Addition

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