lightspeed

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

   Lichtgeschwindigkeit

   ско́рость све́таskórostʹ svéta

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

1. By the time human civilization was a million years old, it had achieved mastery of faster-than-lightspeed voyages.

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