fifth force

fifth force

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

Origin:
1975–80

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World English Dictionary
fifth force
 
n
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)

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
fifth force   (fĭfth)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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