secondary diagonal secondary dentition • secondary dysmenorrhea · · · Info · Definitions · Characters · · secondary diagonal · · Text Common · · Latin · · Scripts 18 · · Length 8 · · Syllables Definitions · · · (noun) the diagonal of a square matrix running from the lower left entry to the upper right entry. Synonyms: secondary diagonal. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 y latin small letter y U+0079