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A post set up to indicate distance in miles, as along a highway.
1. (Horse Racing) horse racing a marking post on a racecourse a mile before the finishing line
2. (Civil Engineering) chiefly US and Canadian a signpost that shows the distance in miles to or from a place. Also called (esp Brit): milestone
1. any of a series of posts set up to mark distance by miles, as along a road, or an individual post showing the distance from a place.