ˈæ.dɪ.tɪv ˈæ.də.tɪv ˈæ.dɪ.tɪv ˈæ.də.tɪv ˈlɪn.i.ɚ ˈlɪn.i.ə characterized or produced by addition an additive process designating or involving an equation whose terms are of the first degree something added to enhance food or gasoline or paint or medicine