illuminant illuminance • illuminate · · · Info · Definitions · Characters · · illuminant · · Text Latin · · Script 10 · · Length Definitions · · · (noun) something that can serve as a source of light. · · Noun Definition 1 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E t latin small letter t U+0074 u latin small letter u U+0075