megatonnage Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. the total explosive power of weapons measured in megatons. Example Sentence The megatonnage of the Soviet Union's nuclear stockpile passed the US. More Example Sentences They measured the megatonnage of the explosion. Synonyms explosive power; yield; force Antonyms building power Hear It! Say It! Write It! megatonnage Switch to cursive Start Share with your friends: