—reductional, adj./ri duk"sheuhn/, n.1. the act of reducing or the state of being reduced.2. the amount by which something is reduced or diminished.3. a form produced by reducing; a copy on a smaller scale.4. Cell Biol. meiosis, esp. the first meiotic cell division in which the chromosome number is reduced by half.5. Chem. the process or result of reducing.6. Motion Pictures. the process of making a print of a narrower gauge from a print of a wider gauge: the reduction of 35-mm films to 16-mm for the school market.7. a village or settlement of Indians in South America established and governed by Spanish Jesuit missionaries.[1475-85; earlier reduccion < MF reduction < L reduction- (s. of reductio) a bringing back, equiv. to reduct(us) (ptp. of reducere; see REDUCE) + -ion- -ION]
* * *IAny of a class of chemical reactions in which the number of electrons associated with an atom or group of atoms is increased.The electrons taken up by the substance reduced are supplied by another substance, often hydrogen (H2), which is thereby oxidized. See also oxidation-reduction.II(as used in expressions)oxidation reduction
* * *any of a class of chemical reactions in which the number of electrons associated with an atom or a group of atoms is increased. The electrons taken up by the substance reduced are supplied by another substance, which is thereby oxidized. See oxidation-reduction reaction.▪ logicin syllogistic, or traditional, logic, method of rearranging the terms in one or both premises of a syllogism, or argument form, to express it in a different figure; the placement of the middle, or repeated, term is altered, usually to a preferred pattern. Aristotle took as primary the first figure, in which the middle term (M) is in the patternS and P being the subject term and predicate term, respectively, of the conclusion; he therefore reduced syllogisms of the second, third, and fourth figures to the first figure. For example, the second figure syllogismcan be reduced to a first figure syllogism by simply converting the first premise to the equivalent “No B is A.”The desire to perform reductions was based on the notion that only syllogisms of the first figure were self-evident. Reduction to other figures, however, could also have been chosen.
* * *