overillumination.
Excess light supplied beyond the amount required for a given task.
Meaning & usage
Excess light supplied beyond the amount required for a given task.
Wasted light through illumination of an unoccupied space, creating energy wastage.
Excessive or annoying light producing glare, annoyance and adverse health effects.
The building's architect failed to account for natural light availability and specified more lighting fixtures than needed, resulting in over-illumination and leading to increased headache incidence for some building occupants.
Where this word comes from
Etymology tree Proto-Indo-European *úp Proto-Indo-European *-er Proto-Indo-European *upér Proto-Germanic *uber Old English ofer- Middle English over- English over- Proto-Indo-European *h₁én Proto-Italic *en Proto-Italic *en- Latin in- Proto-Indo-European *lewk- Proto-Indo-European *-s- Proto-Indo-European *-mn̥ Proto-Indo-European *léwksmn̥ Proto-Italic *louksmən Latin lūmen Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-yéti Proto-Indo-European *-eh₂yéti Proto-Indo-European *-h₂tiinflu. Proto-Italic *-ājō Proto-Italic *-āō Latin -ō Latin lūminō Latin illūminō Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Late Latin illūminātiōbor. Middle French illuminationbor. English illumination English overillumination From over- + illumination.
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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.