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/ˈtæk.i.ɒn/ · noun
(particle physics) A hypothetical particle that travels faster than the speed of light..
Use tachyon when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Tachyon means (particle physics) A hypothetical particle that travels faster than the speed of light..
Common synonyms include tachyonic particle.
The opposite depends on the specific sense.
Use tachyon where its definition matches the intended context.
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