upper bound upper berth • upper cannon · · · Info · Definitions · Characters · · upper bound · · Text Common · · Latin · · Scripts 11 · · Length 3 · · Syllables Definitions · · · (noun) (mathematics) a number equal to or greater than any other number in a given set. Synonyms: upper bound. · · Noun Definition 1 Characters · · space U+0020 b latin small letter b U+0062 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 p latin small letter p U+0070 r latin small letter r U+0072 u latin small letter u U+0075