fifth force

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noun

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

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Origin of fifth force

First recorded in 1975–80

Words nearby fifth force

Fifth Commandment, fifth cranial nerve, fifth dimension, fifth disease, fifth estate, fifth force, fifth-generation, fifthly, fifth monarchy, Fifth Monarchy Men, fifth position

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use fifth force in a sentence

But on Thursday Boxer triggered a Golden State political earthquake, announcing that she would not seek a fifth term in 2016.
The Golden State Preps for the ‘Red Wedding’ of Senate Races|David Freedlander|January 9, 2015|DAILY BEAST
Yet for a vivid decade or so, sleaze was, somewhat paradoxically, a force for literacy and empowerment.
How Pulp Fiction Saved Literature|Wendy Smith|January 8, 2015|DAILY BEAST
Shortly after dawn, there was another outbreak of deadly force.
France Mourns—and Hunts|Nico Hines, Christopher Dickey|January 8, 2015|DAILY BEAST
And Air Force assessors are the first to say such imaging never tells the whole story.
Pentagon Doesn’t Know How Many People It’s Killed in the ISIS War|Nancy A. Youssef|January 7, 2015|DAILY BEAST

Detectives with a fugitive task force caught up with Polanco and a friend on a Bronx street in the early afternoon.
Shot Down During the NYPD Slowdown|Michael Daly|January 7, 2015|DAILY BEAST
The Goliath wouldn't answer; the Dublin said the force was coming off, and we could not get into touch with the soldiers at all.
Gallipoli Diary, Volume I|Ian Hamilton
These Rules (leaving out the Tenor) serves for five bells; and leaving out the fifth and Tenor, they serve for four bells.
Tintinnalogia, or, the Art of Ringing|Richard Duckworth and Fabian Stedman
For this use of the voice in the special service of will-power, or propelling force, it is necessary first to test its freedom.
Expressive Voice Culture|Jessie Eldridge Southwick
But you are mistaken in thinking the force west consists of the entire Merrill Horse.
The Courier of the Ozarks|Byron A. Dunn
After about the forty-fifth year it becomes gradually less; after seventy-five years it is about one-half the amount given.
A Manual of Clinical Diagnosis|James Campbell Todd

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)

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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.