Definition of reduction
2a
: something made by reducing
b
: the amount by which something is reduced
3
[Spanish reducción, from Latin reduction-, reductio]
: a South American Indian settlement directed by Jesuit missionaries
4
: meiosis sense 2
specifically
: production of the gametic chromosome number in the first meiotic division
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Merriam-Webster unabridged
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Time Traveler for reduction
The first known use of reduction was in the 15th century
See more words from the same century