parsec parse • Parsee · · · Info · Definitions · Synonyms · Characters · · parsec · · Text Latin · · Script 6 · · Length Definitions · · · (noun) a unit of astronomical length based on the distance from Earth at which stellar parallax is 1 second of arc; equivalent to 3.262 light years. Synonyms: secpar. · · Noun Definition 1 Synonyms · · · secpar · · Synonym 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073