Definitions
1.adjectivePertaining to the reduction of a decree etc.; rescissory.
2.adjectiveCausing the physical reduction or diminution of something.
3.adjectiveThat reduces a substance etc. to a more simple or basic form.
4.adjectiveThat can be derived from, or referred back to, something else.
5.adjective(now frequently derogatory) That reduces an argument, issue etc. to its most basic terms; simplistic, reductionist.