1. apogee, culmination -- (a final climactic stage; "their achievements stand as a culmination of centuries of development")
2. culmination -- ((astronomy) a heavenly body's highest celestial point above an observer's horizon)
3. climax, culmination -- (the decisive moment in a novel or play; "the deathbed scene is the climax of the play")
4. completion, culmination, closing, windup, mop up -- (a concluding action)
1.
The culmination of Hargraves audacious imitation took place in the third act. - from The Best American Humorous Short Stories by Various