Luminescence
noun /ˌluːmɪˈnɛs(ə)ns/ — The emission of light without heat.
Definition
The emission of light by a substance that has not been heated — including bioluminescence (from living organisms), chemiluminescence (from chemical reactions), and phosphorescence (stored and released light).
Beyond the definition
Luminescence is the quiet light — not the aggressive blaze of a fire or the practical efficiency of a bulb, but the intrinsic glow of a thing illuminated from within. Fireflies, deep-sea creatures, certain mushrooms. Light that does not burn, does not exhaust — it simply glows.
Origin & history
From Latin lumen (light) + -escence (beginning of a process). The light that emerges — a glow arising from within rather than imposed from without.
Example sentences
Illustrative sentences for learning, not verified community posts or sourced quotations.
The bay had a luminescence at night — bioluminescent plankton turning every wave into blue fire.
The mushrooms had a faint luminescence that made the forest floor glow when clouds covered the moon.
She had a luminescence — the kind of person who seems lit from within even in bad lighting.
How to use it
This entry uses a noun. Follow the examples for articles and singular or plural forms; not every noun takes “a” or “an.”
Choose “Luminescence” when the meaning fits your context: The emission of light by a substance that has not been heated — including bioluminescence (from living organisms), chemiluminescence (from chemical reactions), and phosphorescence (stored and released light).
Synonyms
glow, radiance, bioluminescence, phosphorescence
Antonyms
darkness, opacity
Related words
Questions about this word
What does "Luminescence" mean?
Luminescence is noun meaning: The emission of light without heat.. The emission of light by a substance that has not been heated — including bioluminescence (from living organisms), chemiluminescence (from chemical reactions), and phosphorescence (stored and released light).
Where does the word "Luminescence" come from?
From Latin lumen (light) + -escence (beginning of a process). The light that emerges — a glow arising from within rather than imposed from without.