lightspeed

• light speed

light +‎ speed

• Audio (US)

  (file)

lightspeed (countable and uncountable, plural lightspeeds)

1. The speed of light (in vacuum unless another medium is specified)
   • 1994, Ursula K. Le Guin, A Fisherman of the Inland Sea, Victor Gollancz (UK), published 1996, →ISBN, page 7:

     If we're going to a world a hundred light-years from here at near lightspeed, we spend according to our own perceptions, only a few minutes doing so and arrive only a few minutes older.

   • 2005, W. Strawn Douglas, Oracle And Other Stories, page 134:

     He paused, then finished, “with the drive from the Linz, he can do over 500 lightspeeds to meet us.