Definitions for "Milepost"
A post, or one of a series of posts, set up to indicate spaces of a mile each or the distance in miles from a given place.
stone post at side of a road to show distances
a milepost, or milemarker, is a green paddle placed alongside roads and highways that indicate the total mileage from a certain control point. For Interstate routes, the zero milepost is generally at the southern or western end of the route. For all other routes, the location of the zero milepost may vary.
An event or accomplishment marking a significant advance in an endeavor; a notable achievment; as, putting a man in orbit was a big milepost on the way to the moon.
a reference point of significant achievement, marking the completion of a stage in a larger task