Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
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noun
the state of being luminous, or a luminous object; brilliance or radiance
Definition source: English Wiktionary via Wiktextract
Usage: uncountable
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
the ratio of luminous flux to radiant flux at the same wavelength; the luminosity factor
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
Topics: natural-sciences, physical-sciences, physics
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
The rate at which a star radiates energy in all directions.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
Topics: astronomy, natural-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
the quality of being luminous; emitting or reflecting light
Definition source: Princeton WordNet 3.0
Synonyms: brightness, brightness level, luminance, luminousness, light
Antonyms: none provided
Broader terms: physical property
Narrower terms: illuminance, illumination, incandescence, luminescence, glow
History
Borrowed from French luminosité or else a native formation from luminous + -ity.
Across languages
28 source translations are retained for this English entry.
