Definition of "tachyonic" []

• Of or relating to a tachyon or tachyons. (adjective)
• Moving or capable of moving faster than the speed of light. (adjective)

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• "The dispersion relation in this material is shown to be tachyonic, giving rise to group velocities larger than the speed of light."
• "A measurement of pulse transmission through a PCM thus provides an experimental signature of optical tachyonic excitations."
• "If A sends a tachyonic message to B, in another galaxy, and B replies tachyonically, then A gets the reply before he sent the message."