Synonyms and Antonyms for zero-hour

1. zero hour (n.)

the time set for the start of an action or operation

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2. half-hour (n.)

a half of an hour

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5. zero (adj.)

indicating the absence of any or all units under consideration

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7. zero (n.)

a mathematical element that when added to another number yields the same number

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8. zero (adj.)

indicating an initial point or origin

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9. hour (n.)

a special and memorable period

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10. zero (n.)

the sight setting that will cause a projectile to hit the center of the target with no wind blowing

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