lumen

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions
noun a cavity or passage in a tubular organ

Borrowed from Latin lūmen (“light, an opening”). Use as a unit was first adopted by French physicist André Blondel in 1894.

Lumen ad revelationem gentium.--Luke ii, 32. — Pascal's Pensées, Blaise Pascal
Cur aliquid vidi? cur conscia lumina feci? — The Lives of the Twelve Caesars, Complete, Suetonius
If we close the lower part of the eye things appear double to us:-- Bina lucemarum fiorentia lumina flammis... — Essays of Michel de Montaigne — Complete, Michel de Montaigne

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