Definition of tachyon in English:


Syllabification: tach·y·on
Pronunciation: /ˈtakēˌän


  • A hypothetical particle that travels faster than light.
    More example sentences
    • Small subatomic particles such as photons, particles of light, and hypothetical particles called tachyons seem to have no problem reaching light speed.
    • The biggest problem with bosonic string theory (aside from the lack of fermions) is that the lowest energy state was a tachyon, or a particle mode with negative mass squared.
    • The existence of tachyons is allowed by the equations of Einstein's special theory of relativity.


1960s: from tachy- 'swift' + -on.

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Pronunciation: skōSH
a small amount; a little