Verb

To remove the certification of.

*{{quote-news, year=1988, date=November 11, author=Michael Miner, title=Strike Accord at the Tribune; Is the Sun-Times Next?, work=Chicago Reader citation

, passage=As Sallas immediately said, the 130 scabs who so easily replaced the striking printers in '85 won't be foisted upon the union--to degrade it and possibly decertify it.}}

Verb

To cross out something with lines etc.

* Blackstone

A deed may be avoided by delivering it up to be cancelled ; that is, to have lines drawn over it in the form of latticework or cancelli; the phrase is now used figuratively for any manner of obliterating or defacing it.

To invalidate or annul something.

He cancelled his order on their website.

* 1914 , (Marjorie Benton Cooke), Bambi

*:"I don't know what your agreement was, Herr Professor, but if it had money in it, cancel it. I want him to learn that lesson, too."

To mark something (such as a used postage stamp) so that it can't be reused.

This machine cancels the letters that have a valid zip code.

To offset or equalize something.

The corrective feedback mechanism cancels out the noise.

(mathematics) To remove a common factor from both the numerator and denominator of a fraction, or from both sides of an equation.

(media) To stop production of a programme.

(printing, dated) To suppress or omit; to strike out, as matter in type.

(obsolete) To shut out, as with a railing or with latticework; to exclude.

* Milton

cancelled from heaven

(slang) To kill.