IPA: /ˈmaɪlˌpoʊst/
KK: /maɪlpoʊst/
A sign or marker that shows how far you are from a certain place, usually along a road or highway.
We stopped at the milepost to check how far we had traveled.
Milepost is formed from "mile" (from Old English *mīle*, meaning a unit of distance) and "post" (from Old French *poste*, meaning a fixed marker or support). A milepost is a fixed marker indicating the distance in miles along a road or path.
Think of a 'mile' as a unit of distance and a 'post' as a marker — together, a milepost tells you how far you've traveled.