The time at which a planned operation, typically a military one, is set to begin.
- Accompanied by your other three team members, you begin at zero hour of the Clone Wars.
- A few minor adjustments were made to the presentation plan, and we set 3 o'clock as zero hour.
- As zero hour approached, Spanish-language radio stations broadcast appeals for all able-bodied Cuban-Americans to help.
the appointed time, the critical moment, the moment of truth, the point/moment of decision, the Rubicon, the crux
informal the crunch
For editors and proofreaders
Syllabification: ze·ro hour
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