Cancel
Cancel, cancellation, or cancelled may refer to: == Business == Project cancellation, in government and industry Cancellation (mail), a postal marking applied to a stamp or stationery indicating the item has been used Cancellation (insurance), the termination of an insurance policy Flight cancellation and delay, not operating a scheduled flight == Sociology == Cancel culture, boycotting and ostracism calling out offensive behavior on social media or in real life == Technology and science == Cancel leaf, a bibliographic term for replaced leaves in printed books Cancellation property, the mathematical property if a×b = a×c then b = c Cancelling out, a technique for simplifying mathematical expressions Catastrophic cancellation, numerical error arising from subtracting approximations to nearby numbers Noise cancellation, a method for reducing unwanted sound Phase cancellation, the effect of two waves that are out of phase with each other being summed Cancel message, a special message used to remove Usenet articles posted to news servers Cancel character, an indication that transmitted data are in error or are to be disregarded Resolution rule, in propositional logic a valid inference rule that produces a new clause by two clauses containing complementary literals.