lightspeed

noun

1. (countable, uncountable)The speed of light (in vacuum unless another medium is specified).

   “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.”

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

2. (colloquial, countable, figuratively, uncountable)An extremely fast speed.

   “In recent years, other activist terms have followed light-speed trajectories. The term “Latinx” overtook academic institutions and briefly became fashionable in the media, still prevalent in some influential publications, like The New Yorker, even though only 3 percent of Hispanics (or Latinos, if you prefer) use it.”