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additive effect 

Long: An effect in which two substances or actions used in combination produce a total effect the same as the sum of the individual effects.
Short: 2 actions combine to make one big one
Gary: "Yo, wanna combine our soda together to make an additive effect?"
Charlie: "Sure! You put your Sprite first and then I will do mine"

Gary: "We have made such a large sprite"
Charlie: "Indeed"

Food Additive

Shit they put in "food" that usually promotes fat gain, obesity, and health issues. They may include preservatives, flavorings, coloring, or whatever, though it's not a problem because it increases their profit margin, and makes fat people more satisfied by the taste. However, food additives may be a "necessary evil" at times.
The FDA approved another food additive under "generally recognized as safe(GRAS)," though I get the feeling it'll make you a fatass.

additive manufacturing 

Where you use a machine such as a 3D printer on a manufacturing line instead of using a machine that subtracts from the source material
The manufacturing industry is switching to additive manufacturing to save money on source material.