A precanceled stamp, or precancel for short, is a postage stamp that has been cancelled before being affixed to mail. Precanceled stamps are typically used by mass mailers, who can save the postal system time and effort by prearranging to use the precancels, and delivering the stamped mail ready for sorting. Precancels were also used on newspaper ...
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http://en.wikipedia.org/wiki/Precancel
precancel To cancel the postage stamp on an envelope before mailing it.
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http://www.wordinfo.info/words/index/info/view_unit/1744/2
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