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Noun: gigatonne  'gi-gu,tún
  1. A unit of weight equivalent to 1 billion tonnes.
    - Gt
     
  2. [Brit] A measure of the strength of an explosion (or bomb), equivalent to a billion tons of TNT (to produce the same energy)
    - gigaton

Derived forms: gigatonnes

Type of: metric weight unit, weight unit

Encyclopedia: Gigatonne

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