light-year light-witted • light-yellow · · · Info · Definitions · Synonyms · Characters · · light-year · · Text Common · · Latin · · Scripts 10 · · Length Definitions · · · (noun) the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers. Synonyms: light year. · · Noun Definition 1 Synonyms · · · light year · · Synonym 1 Characters · · - hyphen-minus U+002D a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C r latin small letter r U+0072 t latin small letter t U+0074 y latin small letter y U+0079