megatonne

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A form of megaton — A measure of the strength of an explosion or a bomb based on how many million tons of TNT would be needed to produce the same energy. (A derived unit for TNT equivalent.)

OriginEnglish tonne ← Ancient Greek μέγᾰς (mégăs) ← Proto-Hellenic *mégas →
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Meanings

nounmegatonne (plural megatonnes)

plural megatonnes

  1. alternativeAlternative spelling of megaton.

    New vehicles will cut emissions by 5.3 megatonnes by 2010 as part of Ottawa's plans to meet Canada's Kyoto targets.

    2005 April 5, “Ottawa, carmakers reach Kyoto deal”, in CBC News, archived from the original on 25 Nov 2020

Origin

  1. Proto-Indo-European*méǵh₂s
  2. Proto-Hellenic*mégas
  3. Ancient Greekμέγᾰς (mégăs)
  4. Englishmega-
  5. Englishtonne
  6. Englishmegatonne

From mega- + tonne.

Full word history & related roots →

Rhymes & wordplay

Anagrams

nematogen
Cite this entry
APA

megatonne. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/megatonne

MLA

“megatonne.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/megatonne. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “megatonne,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/megatonne.

Source: megatonne on Wiktionary, CC BY-SA 4.0.