The hour (common symbol: h or hr, h being the international form of the symbol) is a unit of measurement of time. In modern usage, an hour comprises 60 minutes, or 3,600 seconds. It is approximately of a mean solar day.
Noun 1. clock time; "the hour is getting late" (synonym) hour (hypernym) clock time, time (hyponym) noon, twelve noon, high noon, midday, noonday, noontide