Culmination
Etymology
From Latin culmen, "top, summit, peak" (a variant of columen, "ridge, height"). It entered English through astronomy: a star was said to "culminate" when it reached its highest point in the sky, directly overhead. From that literal high point the word broadened to any process arriving at its peak or decisive conclusion.
noun · /kul-muh-NAY-shun/
The highest or climactic point reached at the end of a process of development.
What it names
The word for the peak that everything has been building toward — the culmination of years of work, of a career, of a campaign — the moment of fullest achievement.
Example
The exhibition was the culmination of a lifetime spent photographing a single stretch of coastline.
Related idea
Denouement is the resolution that follows a climax; culmination is the climax itself, the summit a long effort finally reaches.