0 relating to subtraction (= the process of removing one number from another): --
Interference is a phenomenon in which two waves either have an additive or subtractive effect on each other's intensity.
Medicine is subtractive in that you need to subtract out anything that is irrelevant until you can isolate the one thing left that works.
Milling machines carve parts in a subtractive process from a blank.
The subtractive equation property states that the two sides of an equation remain equal if the same number is subtracted from each side.