Because a kilometerstone is too much of a mouthfull.
It is called that simply by convention and habit. That is what they were called historically and the name has stuck. It also has a much nicer ring to it than kilometerstone.
Some maps show the location of a milepost, usually a small stone or concrete monument erected adjacent to the shoulder of a road, showing a traveler the distance to or from the next town or milestone.
A milestone was a physical stone marker placed every mile along roads in Britian. On it was written the distance to the next large town. Hence the name.
Some maps show the location of a milepost, usually a small stone or concrete monument erected adjacent to the shoulder of a road, showing a traveler the distance to or from the next town or milestone.
"Stone," "tone," and "known" rhyme with "milestone."
A stone set up beside a road to mark the distance in miles to a particular place.An action or event marking a significant change or stage in development.
A musical mile stone are songs or music numbers that have changed the face of the world!!!!!!!!!!!!!!!!!!1
A milestone.
Milestones are stages in a project at which something is completed.The first milestone is typically "the Design is complete".Further milestones would include:The prototype is completeThe User Interface is ready for testingThe product is ready for Beta testing
The rock popularly known as "Paddy's Milestone" is a type of granite that is often associated with the historic Irish practice of marking distances along roads. The term originates from the practice of using stone markers to indicate milestones for travelers. In Ireland, these stones were commonly referred to as "paddy stones" due to the connection with Irish laborers, or "Paddies," who would often work on road construction. Paddy's Milestone can also refer to a specific type of stone used in traditional Irish roadways.
I assume you are referring to the use of the term in relationship to goals and projects and not the original description of a stone marking off miles on a road. While it is not actually an antonym for a milestone, the opposite could be considered to be "setback".
The distance from Stone Mountain to the base of Mount Everest is 8,122 miles.