1. apogee, culmination

a final climactic stage

Example Sentences:
'their achievements stand as a culmination of centuries of development'

• apogee

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

Example Sentences:
'the deathbed scene is the climax of the play'

• climax

4. closing, completion, culmination, mop up, windup

a concluding action

• closing
• completion
• mop up
• windup