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semipostal

[sem-ee-pohs-tl, sem-ahy-]Philately.
noun
  1. a postage stamp sold by a government at a premium above its face value, the excess being used for a nonpostal purpose, as a charity.
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adjective
  1. noting or pertaining to such a stamp.
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Origin of semipostal

First recorded in 1925–30; semi- + postal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for semipostal

semipostal

adjective
  1. philately, mainly US denoting stamps where all or part of the receipts from sale are given to some charitable cause
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012