Milestone
Synonyms: Landmark, Benchmark, Significant event, Goal, Breakthrough, Milestone event, Important stage, Notable event, Pivotal moment, Progress marker, Achievement, Turning point, Target, Marker, Accomplishment, Checkpoint, High point, Reference point, and Key event.
Example Sentences
Graduation was a major milestone achieved.
They celebrated their milestone anniversary happily.
This project marks an important milestone.
Reaching that goal was a significant milestone.