milestone

A stone marker set up on a roadside to indicate the distance in miles from a given point.

An important event, as in a child’s development, the history of a nation, or the advancement of knowledge in a field; a turning point.

A stone or pillar set up along a highway or other line of travel to mark distance in miles.

A stone serving the same purpose as a milepost.

An event or accomplishment marking a significant advance in an endeavor; a notable achievment.

A stone milepost (or by extension in other materials), one of a series of numbered markers placed along a road at regular intervals, typically at the side of the road or in a median.

An important event in a person’s life or career, in the history of a nation, in the life of some project etc.

stone post at side of a road to show distances

a significant event in your life (or in a project)