To diffuse by osmosis.
To cause to diffuse by osmosis.
To decrease the liquid content of food by boiling much of its water off.
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 convert a syllogism to a clearer or simpler form.
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 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).