Etymology

fiat lux

Today it means: Let there be light, especially in the context of light being a metaphor for wisdom. Full definition →

Latin fīat lūx
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The story

  1. Latin · borrowed fromfīat lūx“let there be light”
  2. English todayfiat lux

From Latin fīat lūx (“let there be light”).

Etymology from Wiktionary, CC BY-SA 4.0.