secondo secondness • second-order reaction · · · Info · Definitions · Characters · · secondo · · Text Latin · · Script 7 · · Length 3 · · Syllables Definitions · · · (noun) the second or lower part of a duet (especially a piano duet). · · Noun Definition 1 Characters · · c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073