n.
Pronunciation: ' a-d ə -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 \ ˌ a-d ə - ' ti-v ə -t ē \ noun