(uncountable) The act of adding anything. / Anything that is added. / (uncountable) The arithmetic operation of adding.

Supplemental or added to something.

Something added.

(conjunctive, idiomatic) Also; as well; besides.

plural of addition

plural of additional

as well as; besides

(mathematics) Pertaining to addition; that can be, or has been, added. / (mathematics, of a function, etc.) That is distributive over addition.

A substance added to another substance or product to produce specific properties in the combined substance. / (grammar) A word or phrase that adds something, such as also, even, or nor.

plural of additive