ground zero Hear it!

ground zero definition

☆ ground zero

  1. the land or water surface area directly below or above the point of detonation of a nuclear bomb
  2. Slang
    1. nothing
    2. the starting point
    3. the most basic condition or level

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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