MILESTONE

milepost [noun] [C] - a stone or post at the side of the road on which is marked the distance to various places, esp. to the nearest large town, or (figurative) an important event in the development or history of something or in someone's life(figurative) At the time, the shooting seemed like a fateful milestone on the road to war.(figurative) He felt that moving out from his parents' home was a real milestone in his life.