| alumina | (noun) any of various forms of aluminum oxide occurring naturally as corundum | Synonyms: aluminium oxide, aluminum oxide |
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| aluminate | (noun) a compound of alumina and a metallic oxide | - |
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| aluminiferous | (adjective) containing alum or aluminum | - |
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| aluminise | (verb) cover with aluminum | Synonyms: aluminize |
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| aluminium | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminum, atomic number 13 |
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| aluminize | (verb) cover with aluminum | Synonyms: aluminise |
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| aluminous | (adjective) pertaining to or containing aluminum or alum | - |
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| aluminum | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminium, atomic number 13 |
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| bioluminescence | (noun) luminescence produced by physiological processes (as in the firefly) | - |
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| bioluminescent | (adjective) (of living organisms) emitting light | - |
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| chemiluminescence | (noun) luminescence resulting from a chemical reaction as the oxidation of luciferin in fireflies | - |
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| chemiluminescent | (adjective) relating to the phenomenon of chemiluminescence | - |
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| illuminance | (noun) the luminous flux incident on a unit area | Synonyms: illumination |
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| illuminant | (noun) something that can serve as a source of light | - |
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| illuminate | (verb) introduce light into | Synonyms: illume, illumine, light, light up |
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| (verb) make free from confusion or ambiguity; make clear | Synonyms: clear, clear up, crystalise, crystalize, crystallise, crystallize, elucidate, enlighten, shed light on, sort out, straighten out |
| (verb) add embellishments and paintings to (medieval manuscripts) | - |
| illuminated | (adjective) provided with artificial light | Synonyms: lighted, lit, well-lighted |
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| illuminating | (adjective) tending to increase knowledge or dissipate ignorance | Synonyms: enlightening, informative |
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| illumination | (noun) painting or drawing included in a book (especially in illuminated medieval manuscripts) | Synonyms: miniature |
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| (noun) the luminous flux incident on a unit area | Synonyms: illuminance |
| (noun) an interpretation that removes obstacles to understanding | Synonyms: clarification, elucidation |
| (noun) the degree of visibility of your environment | - |
| (noun) a condition of spiritual awareness; divine illumination | Synonyms: light |
| illumine | (verb) introduce light into | Synonyms: illume, illuminate, light, light up |
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| luminaire | (noun) an electrical device used to create artificial light by use of an electric lamp; all light fixtures have a fixture body and a light socket to hold the lamp and allow for its replacement | Synonyms: light fitting, light fixture |
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| luminance | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminosity, luminousness |
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| luminary | (noun) a celebrity who is an inspiration to others | Synonyms: guiding light, leading light, notability, notable |
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| luminesce | (verb) be or become luminescent; exhibit luminescence | - |
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| luminescence | (noun) light from nonthermal sources | Synonyms: glow |
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| (noun) light not due to incandescence; occurs at low temperatures | - |
| luminescent | (adjective) emitting light not caused by heat | - |
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| luminism | (noun) an artistic movement in the United States that was derived from the Hudson River school; active from 1850 to 1870; painted realistic landscapes in a style that pictured atmospheric light and the use of aerial perspective | - |
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| luminosity | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminance, luminousness |
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| luminous | (adjective) softly bright or radiant | Synonyms: aglow, lambent, lucent |
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| luminousness | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminance, luminosity |
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| unilluminated | (adjective) without illumination | Synonyms: lightless, unlighted, unlit |
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| unilluminating | (adjective) failing to inform or clarify | Synonyms: unenlightening |
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| voluminosity | (noun) greatness of volume | Synonyms: fullness, voluminousness |
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| voluminous | (adjective) large in number or quantity (especially of discourse) | Synonyms: copious |
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| (adjective) marked by repeated turns and bends | Synonyms: tortuous, twisting, twisty, winding |
| (adjective) large in volume or bulk | - |
| voluminously | (adverb) in a voluminous manner | - |
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| voluminousness | (noun) greatness of volume | Synonyms: fullness, voluminosity |
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