culmination

(noun) a final climactic stage. Synonyms: apogee. Example: "Their achievements stand as a culmination of centuries of development."

(noun) (astronomy) a heavenly body's highest celestial point above an observer's horizon.

(noun) the decisive moment in a novel or play. Synonyms: climax. Example: "The deathbed scene is the climax of the play."

(noun) a concluding action. Synonyms: completion, closing, windup, mop up.