LATIN DICTIONARYLexicon Latīnum
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“reduction” in Latin

The English word reduction itself goes back to Latin dūcō, through reductio.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

reduction
A bringing back, reductio: reportatio.
A diminishing, lessening, minutio: imminutio: extenuatio (in size or circumference): levatio (a lightening): remissio (a relaxation). To suffer a reduction in price, vilius fieri or venire [Vid: FALL].
A subduing, taking by storm, expugnatio; or by circumlocution with the verbs.
A rule in arithmetic, *reductio (technical term). Other meanings by circumlocution with verbs.

Quick answer

What is the Latin word for reduction?
The usual Latin words for “reduction” are reductiō, mĭnūtĭo, imminūtiō; also extenuātiō, levātiō, remissiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.