illumination unit illumination • illuminational · · · Info · Definitions · Characters · · illumination unit · · Text Common · · Latin · · Scripts 17 · · Length 7 · · Syllables Definitions · · · (noun) a measure of illumination. Synonyms: illumination unit. · · Noun Definition 1 Characters · · space U+0020 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 o latin small letter o U+006F t latin small letter t U+0074 u latin small letter u U+0075