adjective Astronomy.
appearing to travel faster than the speed of light.

super- + Latin lūmin-, stem of lūmen light + -al1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superluminal (ˌsuːpəˈluːmɪnəl)
physics of or relating to a speed or velocity exceeding the speed of light

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
In other words, it might be used to convey information at superluminal
On other side, that oscillation is necessary for superluminal particles.
True superluminal velocities are not achievable through linear drive.
Not quite as exciting as superluminal neutrinos, but if it holds up it's big
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