reduction (nom)
Sens 1 : an act of making something less or smaller; the state of being made less or smaller. [source : OAAD]
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Sens 2 : a decrease in the size, price, or amount of something, or the act of decreasing something. [source : LG]
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Sens 3 : a copy of a photograph, map, picture, etc. that is made smaller than the original one. [source : OAAD]