The invention of the railroad was a milestone in the history of transportation.
A milestone in a baby's life is when they learn how to walk.
Graduation is a huge milestone in a young adult's life.
Do you remember what the milestone is to find the old country road?
When writing her autobiography, Alice tried to highlight all of the milestones in her success.
Did we already pass the milestone where we were supposed to make a turn?
What do you think has been the biggest milestone in your personal growth?
Abolishment of slavery was a huge milestone in America's history.
It's easy to miss the road to our house, but there is a milestone on the highway to remind you where the exit is.