To invalidate or annul something.
To cross out something with lines etc.
To offset or equalize something.
To kill.
To remove a common factor from both the numerator and denominator of a fraction, or from both sides of an equation.
To cease to provide financial or moral support to (someone deemed unacceptable). Compare cancel culture.
To stop production of a programme.
To mark something (such as a used postage stamp) so that it can't be reused.
A cancellation (US); (nonstandard in some kinds of English).
The page thus suppressed.
A control message posted to Usenet that serves to cancel a previously posted message.
The page that replaces it.
The suppression on striking out of matter in type, or of a printed page or pages.
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 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).