Definition from Wiktionary, the free dictionary
milepost (plural mileposts)
- A post on a highway, often with one or more fingerposts, showing the distance in miles to nearby places
- (rail transport) A sign or post beside a railway marking the distance from the (actual or nominal) start of a line (usually the principal terminus or junction with a more major line)
- To place mileposts along (a road, etc.).