reduction

The definition of a reduction is a decrease or a lessening in amount, or the amount by which something decreases or goes down.

(noun)

When the income tax rate is cut, this is an example of a time when you get a reduction in taxes.
When a price goes down by 10 percent, this is an example of a 10 percent reduction.

See reduction in Webster's New World College Dictionary

noun

a reducing or being reduced
anything made or brought about by reducing, as a smaller copy, lowered price, sauce of concentrated liquid, etc.
the amount by which anything is reduced

Origin: LME reduccion < MFr reduction < L reductio < reductus, pp. of reducere

Related Forms:

See reduction in American Heritage Dictionary 4

noun

The act or process of reducing.
The result of reducing: a reduction in absenteeism.
The amount by which something is lessened or diminished: a reduction of 12 percent in violent crime.
Biology The first meiotic division, in which the chromosome number is reduced. Also called reduction division.
Chemistry
a. A decrease in positive valence or an increase in negative valence by the gaining of electrons.
b. A reaction in which hydrogen is combined with a compound.
c. A reaction in which oxygen is removed from a compound.
Mathematics
a. The canceling of common factors in the numerator and denominator of a fraction.
b. The converting of a fraction to its decimal equivalent.
c. The converting of an expression or equation to its simplest form.