climax
US /ˈklaɪ.mæks/
UK /ˈklaɪ.mæks/

1.
the most intense, exciting, or important point of something; a culmination or apex.
:
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The movie reached its climax with the final battle scene.
•
The tension built up to a dramatic climax.
1.
reach a climax or turning point.
:
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The tension in the room began to climax as the verdict was read.
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The story slowly builds, then climaxes in a thrilling chase scene.