lightspeed

Etymology

From light + speed.

lightspeed means the speed of light (in vacuum unless another medium is specified). Lexicurio rates it Sui generis — a strength score of 95 out of 100.

noun

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.”
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.”