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The act or process of splitting into parts.
(noun)
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A nuclear reaction in which an atomic nucleus, especially a heavy nucleus such as an isotope of uranium, splits into fragments, usually two fragments of comparable mass, releasing from 100 million to several hundred million electron volts of energy.
(noun)
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Biology An asexual reproductive process in which a unicellular organism divides into two or more independently maturing daughter cells.
(noun)
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To cause (an atom) to undergo fission.
(verb-transitive)
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To undergo fission.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.