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a theoretical force in nature in addition to the strong and weak forces, gravitation, and the electromagnetic force.
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)
fifth force
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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  • Fifth-generation

    adjective 1. denoting developments in computer design to produce machines with artifical intelligence

  • Fifth-generation computer

    noun the generation of computers being designed to expand the use of artificial intelligence, natural language, and expert systems Usage Note computing

  • Fifth generation language

    language, artificial intelligence A myth the Japanese spent a lot of money on. In about 1982, MITI decided it would spend ten years and a lot of money applying artificial intelligence to programming, thus solving the software crisis. The project spent its money and its ten years and in 1992 closed down with a wimper. […]

  • Fifthly

    [fifth-lee] /ˈfɪfθ li/ adverb 1. in the fifth place; fifth.

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