Meaning of ADDITIVE in English

I. adjective Date: 1699 of, relating to, or characterized by addition , produced by addition, 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, ~ly adverb additivity noun II. noun Date: 1945 a substance added to another in relatively small amounts to effect a desired change in properties

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.