Tachyon definitions

tăk'ē-ŏn'
A hypothetical subatomic particle that always travels faster than the speed of light.
noun
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A theoretical subatomic particle conceived of as traveling faster than the speed of light.
noun
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A hypothetical subatomic particle that travels faster than the speed of light. Although the principles of relativity forbid the acceleration of a particle past the speed of light, they do not prohibit the existence of particles that have always moved faster than that speed. No such particle has ever been detected.
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(physics) A hypothetical particle that travels faster than the speed of light.
noun
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(physics) A flaw in a physical theory that predicts the existence of tachyons or similar paradoxical results. Compare with ghost.
noun
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Origin of tachyon

tachy- + -on