Definition of megatonnage in US English:

megatonnage

noun

  • See megaton

    • ‘In a nightmare future of nuclear conflict, megatonnage would matter.’
    • ‘Oil and coal were fast becoming memories, and incredible advances in solar power had come to nothing, due to greenhouse clouds and the megatonnage of dirt thrown into the atmosphere by the Nine Days War.’

Pronunciation

megatonnage

/ˌmeɡəˈtənij/