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Meaning of semipostal

sem•i•post•al

Pronunciation: (sem"ē-pōs'tl, sem"ī-), [key]
— Philately. Philately.
—n.
  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.
—adj.
  1. noting or pertaining to such a stamp.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.