[ri-doos, -dyoos]
verb (used with object), reduced, reducing.
to bring down to a smaller extent, size, amount, number, etc.: to reduce one's weight by 10 pounds.
to lower in degree, intensity, etc.: to reduce the speed of a car.
to bring down to a lower rank, dignity, etc.: a sergeant reduced to a corporal
to treat analytically, as a complex idea.
to lower in price.
to bring to a certain state, condition, arrangement, etc.: to reduce glass to powder.
to bring under control or authority.
Cookery. to evaporate water from (a sauce, soup, or other liquid), usually by boiling.
Photography. to lessen the density of (an exposed negative).
to adjust or correct by making allowances, as an astronomical observation.
Mathematics. to change the denomination or form, but not the value, of (a fraction, polynomial, etc.).
to add electrons to.
to deoxidize.
to add hydrogen to.
to change (a compound) so that the valence of the positive element is lower.
Chemistry, Metallurgy. to bring into the metallic state by separating from nonmetallic constituents.
to thin or dilute: to reduce paint with oil or turpentine.
to lower the alcoholic concentration of (spirits) by diluting with water.
Surgery. to restore to the normal place, relation, or condition, as a fractured bone.
Phonetics. to modify the quality of (a speech sound) to one of lesser distinctiveness, especially to pronounce (an unstressed vowel) as (ə) or another centralized vowel, as in the unstressed syllables of medicinal.
verb (used without object), reduced, reducing.
to become reduced.
to become lessened, especially in weight.
to be turned into or made to equal something: All our difficulties reduce to financial problems.
Cell Biology. to undergo meiosis.

1325–75; Middle English reducen to lead back < Latin redūcere to lead back, bring back, equivalent to re- re- + dūcere to lead

antireducing, adjective, noun
nonreducing, adjective
overreduce, verb, overreduced, overreducing.

1. diminish, decrease, shorten, abridge, curtail, contract, retrench. 1, 2. lessen, attenuate, abate. 3. degrade, demote, humble. 7. subdue, subjugate, conquer, subject, vanquish, overcome, overpower.

1. increase. 3. elevate, exalt. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reduce (rɪˈdjuːs)
1.  (also intr) to make or become smaller in size, number, extent, degree, intensity, etc
2.  to bring into a certain state, condition, etc: to reduce a forest to ashes; to reduce someone to despair
3.  (also intr) to make or become slimmer; lose or cause to lose excess weight
4.  to impoverish (esp in the phrase in reduced circumstances)
5.  to bring into a state of submission to one's authority; subjugate: the whole country was reduced after three months
6.  to bring down the price of (a commodity): the shirt was reduced in the sale
7.  to lower the rank or status of; demote: he was reduced from corporal to private; reduced to the ranks
8.  to set out systematically as an aid to understanding; simplify: his theories have been reduced in a popular treatise
9.  maths to modify or simplify the form of (an expression or equation), esp by substitution of one term by another
10.  cookery to make (a sauce, stock, etc) more concentrated by boiling away some of the water in it
11.  to thin out (paint) by adding oil, turpentine, etc; dilute
12.  (also intr) chem
 a.  to undergo or cause to undergo a chemical reaction with hydrogen or formation of a hydride
 b.  to lose or cause to lose oxygen atoms
 c.  Compare oxidize to undergo or cause to undergo an increase in the number of electrons
13.  photog to lessen the density of (a negative or print) by converting some of the blackened silver in the emulsion to soluble silver compounds by an oxidation process using a photographic reducer
14.  surgery to manipulate or reposition (a broken or displaced bone, organ, or part) back to its normal site
15.  (also intr) biology to undergo or cause to undergo meiosis
[C14: from Latin redūcere to bring back, from re- + dūcere to lead]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "bring back," from O.Fr. reducer (14c.), from L. reducere, from re- "back" + ducere "bring, lead" (see duke). Sense of "to lower, diminish, lessen" is from 1787. Etymological sense preserved in military reduce to ranks (1640s). Reduction is attested from late 15c.;
reductionism in philosophy is recorded from 1948.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

reduce re·duce (rĭ-dōōs', -dyōōs')
v. re·duced, re·duc·ing, re·duc·es

  1. To bring down, as in extent, amount, or degree; diminish.

  2. To lose weight, as by dieting.

  3. To restore a fractured or displaced body part to a normal condition or position.

  4. To decrease the valence of an atom by adding electrons.

  5. To remove oxygen from a compound.

  6. To add hydrogen to a compound.

re·duc'er n.
re·duc'i·bil'i·ty n.
re·duc'i·ble adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

REDUCE definition

language, mathematics
A symbolic mathematics language with ALGOL-like syntax, written in Lisp by Anthony Hearn in 1963.
Reduce 2 is a version based on Portable Standard LISP.
E-mail: .
["REDUCE, Software for Algebraic Computation", G. Rayna, Springer 1987].
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
And on a small scale in your own house if you grow it in dilute urine, you
  reduce the fertilizer load on the local ecosystem.
But some experts argue that single-option penalties could reduce already low
  reporting levels of the incidents.
Although the industry debates environmental and energy benefits, bans and taxes
  to reduce plastic bag use have swept the world.
You'd reduce water use and end runoff by recycling water in a closed irrigation
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