The time of the day or week when one is at work, working time.

crucial moment, especially in which one can finally show his potential or must reckon with something / moment of death

plural of quarter-hour

plural of quarter of an hour

plural of little hour

plural of watt-hour meter

A timekeeping convention in which the 24 hours of the day are treated as a single period, rather than two sets of 12 hours.

A timekeeping convention in which the 24 hours of the day are divided into two periods called ante meridiem and post meridiem.

(informal) The very early morning, just after midnight, when most people are asleep.

The final hour of trading during which three types of derivatives contracts expire.