Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

Comprehensive
Dictionary Suite
Help
Help
Help
 
Advanced Dictionary    
Display options
 
Lookup History
zero hour

zero hour

 
pronunciation:
zi ro aU r
part of speech: noun
definition 1: the time at which a military attack or other operation is scheduled to begin.
definition 2: the time at which an important event is scheduled to start, or any crucial moment.