Meanings
nounilluminance (countable and uncountable, plural illuminances)
plural illuminances
- countableuncountablenatural sciencesThe luminous flux incident on unit area of a surface; commonly measured in lux (lumen/metre²) or otherwise foot-candles. The illuminance of a star upon the earth is frequently measured on a negative logarithmic scale referred to as its apparent magnitude, which see.
Synonyms & antonyms
nounthe luminous flux incident on a unit area
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Also see
Synonym sets from Open English WordNet, CC BY 4.0.
Cite this entry
APA
illuminance. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/illuminance
MLA
“illuminance.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/illuminance. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “illuminance,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/illuminance.
Source: illuminance on Wiktionary, CC BY-SA 4.0.