- fifth force
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a theoretical force in nature in addition to the strong and weak forces, gravitation, and the electromagnetic force.[1975-80]
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Universalium. 2010.
fifth force
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fifth force — fifth′ force′ n. phs a theoretical force in nature in addition to the strong and weak forces, gravitation, and the electromagnetic force • Etymology: 1975–80 … From formal English to slang
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