one twenty-fourth of a full day-night cycle (as opposed to one twelfth of a night or a day)

Synonym of temporal hour

Thirty minutes.

plural of hour of need

(idiomatic) the time when help is most needed

plural of engine hour

An hour of operation of an engine.

The hours and days when a given business is available to the public. / The hours and days when businesses generally operate; 8:00 AM to 5:00 PM, Monday to Friday.

A drinking game in which players are challenged to drink a specified large number of shots of alcoholic drink within one hour.

plural of blue hour