fifth force

noun

a theoretical force in nature in addition to the strong and weak forces, gravitation, and the electromagnetic force.

Origin of fifth force

First recorded in 1975–80

Words nearby fifth force

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British Dictionary definitions for fifth force

fifth force

noun

a hypothetical non-Newtonian repulsive component of the force of gravity, postulated as an addition to the four known fundamental forces (gravitational, electromagnetic, strong, and weak)

Scientific definitions for fifth force

fifth force
[ fĭfth ]

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.