To change the form or structure of.
To castrate, neuter or spay (a dog or other animal).
To tailor clothes to make them fit.
To become different.
To affect mentally, as by psychotropic drugs or illness.
An identity or headmate of a person with dissociative identity disorder (previously known as multiple personality disorder). A member of a system.
To convert a syllogism to a clearer or simpler form.
To annul by legal means.
To convert to written form. (Usage note: this verb almost always appears as "reduce to writing".)
To lose weight.
To perform a reduction; to restore a fracture or dislocation to the correct alignment.
To bring to an inferior state or condition.
To simplify an equation or formula without changing its value.
To bring to an inferior rank; to degrade, to demote.
To add electrons / hydrogen or to remove oxygen.
To humble; to conquer; to subdue; to capture.
To bring down the size, quantity, quality, value or intensity of something; to diminish, to lower.
To strike off the payroll.
To decrease the liquid content of food by boiling much of its water off.
To produce metal from ore by removing nonmetallic elements in a smelter.
To express the solution of a problem in terms of another (known) algorithm.
To reform a line or column from (a square).