: a process in which the nucleus of a heavy atom is split apart
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In the ’60s, obviously, there were narratives that had to do with fear over nuclear fission and the dangers of the bomb.—Fiction Non Fiction, Literary Hub, 18 June 2026 Unlike its counterpart, nuclear fission, fusion energy does not produce large amounts of radioactive waste that need to be stored safely.—Ameya Paleja, Interesting Engineering, 17 June 2026 Fusion machines do not rely on the same process as traditional nuclear fission reactors and have different fuel cycles, waste streams, and safety characteristics, officials said.—Stephen Underwood, Hartford Courant, 3 May 2026 The mission would mark the first test of using nuclear fission to power an interplanetary spacecraft.—Adam Kovac, Scientific American, 28 Apr. 2026 See All Example Sentences for nuclear fission