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A unit of explosive energy equal to that of one million metric tons of TNT.

meg′a·ton′nage (-tŭn′ĭj) n.


the explosive power of a nuclear weapon, or the total explosive power of multiple nuclear weapons, expressed in megatons
References in periodicals archive ?
In terms of total megatonnage, the advantage certainly lies with the other side.
The alternative to numbers, the megatonnage of weapons, is also being considered, but numbers are likely to trump yields.
The best information is that North Korea now has at most two small atomic bombs--not the megatonnage class that could inflict "hundreds of thousands" of casualties.