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| rel·a·tiv·i·ty [ rèllə tívvətee ] |
noun |
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| Definition: |
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1. physics equivalence of mass and energy: the first of two theories describing the relationship of matter, time, and space, showing that mass and energy are equivalent, and that mass, length, and time change with velocity. The theory is based on two assumptions: that the speed of light in a vacuum is constant, and that physical laws have the same mathematical form throughout the universe.
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2. physics theory of gravitation and acceleration: the second of two theories describing the relationship of matter, time, and space, extending the principles of the first to gravitation and phenomena related to acceleration
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3. philosophy dependence on contextually variable factor: dependence on a factor that varies according to context
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4. fact of being relative: the fact or state of being relative to something else
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