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(transitive) To bring down the size, quantity, quality, value or intensity of something; to diminish, to lower.
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(intransitive) To lose weight.
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(transitive) To bring to an inferior rank; to degrade, to demote.
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(transitive) To humble; to conquer; to subdue; to capture.
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(transitive) To bring to an inferior state or condition.
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(transitive) To be forced by circumstances (into something one considers unworthy).
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(transitive, cooking) To decrease the liquid content of food by boiling much of its water off.
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(transitive, chemistry) To add electrons / hydrogen or to remove oxygen.
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(transitive, metallurgy) To produce metal from ore by removing nonmetallic elements in a smelter.
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(transitive, mathematics) To simplify an equation or formula without changing its value.
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(transitive, computer science) To express the solution of a problem in terms of another (known) algorithm.
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(transitive, logic) To convert a syllogism to a clearer or simpler form.
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(transitive, law) To convert to written form. (Usage note: this verb almost always appears as "reduce to writing".)
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(transitive, medicine) To perform a reduction; to restore a fracture or dislocation to the correct alignment.
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(transitive, military) To reform a line or column from (a square).
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(transitive, military) To strike off the payroll.
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(transitive, Scots law) To annul by legal means.
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(transitive, phonetics, phonology) To pronounce (a sound or word) with less effort.
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(transitive, obsolete) To translate (a book, document, etc.).