plural of dinner-hour

(education, academics, US) A course credit based on the number of contact hours per week in class, for one given term or semester.

plural of credit hour

plural of horsepower-hour

(electricity) A unit of energy equal to the amount of work a horse is capable of delivering during an hour.

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

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

(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.

A meter which measures, and registers, the amount of electricity consumed in a circuit; especially one connected to a domestic power supply for the purpose of billing