nuclear fission

noun

physics
: a process in which the nucleus of a heavy atom is split apart

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Initial criticality means the reactor sustained a self-supporting nuclear fission chain reaction. — Aamir Khollam, Interesting Engineering, 11 Sep. 2026 Albert Einstein was aghast at how nuclear fission had been put to first use. — Orlando Sentinel, The Orlando Sentinel, 8 Sep. 2026 Like traditional nuclear power plants, small modular reactors use nuclear fission to generate heat that can be turned into electricity. — Los Angeles Times, 28 Aug. 2026 Founded in 2023, Antares is a nuclear fission energy company developing compact microreactors for defense and space applications. — Mark Price, Charlotte Observer, 27 Aug. 2026 See All Example Sentences for nuclear fission

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“Nuclear fission.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nuclear%20fission. Accessed 2 Oct. 2026.

Medical Definition

nuclear fission

noun
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