Main Entry: ¹ad·di·tive

Pronunciation: \ˈa-də-tiv\

Function: adjective

Date: 1699

1 : of, relating to, or characterized by addition <an additive process>
2 : produced by addition
3 : characterized by, being, or producing effects (as drug responses or gene products) that when the causative factors act together are the sum of their individual effects

— ad·di·tive·ly adverb

— ad·di·tiv·i·ty \ˌa-də-ˈti-və-tē\ noun