Definitions:

1. the decisive moment in a novel or play noun
   • the deathbed scene is the climax of the play
2. the highest point of anything conceived of as growing or developing or unfolding noun
   • the climax of the artist's career
3. to end, especially to reach a final or climactic stage verb
   • The plot climaxed with a ten minute long action sequence.

Synonyms:

• coming
• culminate
• culmination
• flood tide