- 1[countable, uncountable] reduction (in something) an act of making something less or smaller; the state of being made less or smaller a 33% reduction in the number of hospital beds available There has been some reduction in unemployment. a slight/significant/substantial/drastic reduction in costs The report recommends further reductions in air and noise emissions.
- 2[countable] an amount of money by which something is made cheaper There are reductions for children sharing a room with two adults.
- 3[countable] a copy of a photograph, map, picture, etc. that is made smaller than the original one opposite enlargement
- 4 [uncountable, countable] (chemistry) the fact of adding one or more electrons to a substance, or of removing oxygen from a substance
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