milestone
UK: ˈmaɪl.stəʊn | US: ˈmaɪl.stoʊn
n. a significant event or stage in development
n. a stone marker placed beside a road to indicate distance in miles
The word "milestone" originated in the early 17th century, combining "mile" (from Latin milia passuum, meaning "thousand paces") and "stone" (Old English stān). Historically, milestones were literal stone markers placed along Roman roads to measure distances in miles. Over time, the term evolved metaphorically to denote any significant event marking progress in a journey or project. The logic reflects both physical measurement and symbolic achievement.
Graduating college was a major milestone in her life.
The team celebrated reaching the project's halfway milestone.
Ancient Roman roads were lined with milestones for travelers.
The invention of the internet marked a milestone in communication.
Parents often see their child's first steps as a developmental milestone.