watt-hour watt second • watt-second · · · Info · Definitions · Characters · · watt-hour · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) a unit of energy equal to the power of one watt operating for one hour. · · Noun Definition 1 Characters · · - hyphen-minus U+002D a latin small letter a U+0061 h latin small letter h U+0068 o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075 w latin small letter w U+0077