the explosive power of a nuclear weapon, or the total explosive power of multiple nuclear weapons, expressed in megatons
megatonnage in American English
(ˈmeɡəˌtʌnɪdʒ)
noun
the destructive capacity of nuclear explosives as measured in megatons
Word origin
[1960–65; megaton + -age, after tonnage]This word is first recorded in the period 1960–65. Other words that entered Englishat around the same time include: bicycle kick, buyback, deinstitutionalize, disco, tag question