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zero-base
zero-coupon
zero-defect
zero elasticity
zero-emission
zero gravity
zero grazing
zero growth
zero hour
zero in
zero-minus tick
zero option
zero out
zero-plus tick
zero population growth
zero-rate
zero-sum
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zero hour
ze·ro hour


noun 
Definition:
 
1. scheduled start of military operation: the time set for the start of a military operation
2. time when something important will occur: the time or date when something important is due to happen
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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