milestone(redirected from Postmile)
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a stone pillar that shows the distance in miles to or from a place
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A marker showing the distance in miles from a designated location; before the 19th century, such markers were especially helpful to those traveling between outlying communities.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.