lumen.
lumen (derived SI unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela)
Meaning & usage
lumen (derived SI unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela)
Where this word comes from
Etymology tree Proto-Indo-European *lewk- Proto-Indo-European *-s- Proto-Indo-European *-mn̥ Proto-Indo-European *léwksmn̥ Proto-Italic *louksmən Latin lūmenlbor. Polish lumen Learned borrowing from Latin lūmen.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.