A substance added in small amounts to something else to improve, strengthen, or otherwise alter it. Additives are used for a variety of reasons. They are added to food, for example, to enhance taste or color or to prevent spoilage. They are added to gasoline to reduce the emission of greenhouse gases, and to plastics to enhance molding capability.
Relating to the production of color by the mixing of light rays of varying wavelengths. ♦ The additive primaries red, green, and blue are those colors whose wavelengths can be mixed in different proportions to produce all other spectral colors. Compare subtractive. See Note at color.
Mathematics Marked by, produced by, or involving addition.