Fifth-force meaning

fĭfth
Any of the hypothetical forces believed to cause bits of matter to repel each other but not to be strong enough to counteract gravity.
noun
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Any of various hypothetical, very weak forces thought to cause bodies to repel each other. Such forces are occasionally considered as a solution to unexpected deviations in the measured value of the gravitational constant or to explain the apparent acceleration of very distant galaxies away from earth.
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