postage stamp definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a government stamp to be put on a letter or package as a sign that the postage has been prepaid: it is either a small, printed, gummed label or a design imprinted on an envelope, postal card, etc.
postage stamp definition by American Heritage Dictionary
A small, usually adhesive label issued by a government and sold in various denominations to be affixed to items of mail as evidence of the payment of postage.
Very small: postage-stamp villages; a postage-stamp farm.