semipostal

[sem-ee-pohs-tl, sem-ahy-]Philately.

noun

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.

adjective

noting or pertaining to such a stamp.

Origin of semipostal

First recorded in 1925–30; semi- + postal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for semipostal

semipostal

adjective

philately, mainly US denoting stamps where all or part of the receipts from sale are given to some charitable cause
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