(Christianity) the hour of fasting and prayer before communion is to be taken. / (Ireland, informal) the hour between 2.30 pm and 3.30 pm that pubs formerly had to shut to comply with licencing laws.

The time at (or very close to) half the next hour of time.

Around four to five o'clock in the morning.

(Christianity) One of the canonical hours of prime, terce, sext, nones, and usually compline, the services of which are shorter and considered less important than the three major hours of matins, lauds, and vespers.

A unit of energy, especially of electrical energy, equal to that done by one megawatt acting for one hour (abbreviation: MWh).

plural of zero hour

(idiomatic) A point in time or a relatively brief period of time when an especially distinguished, admirable, or effective set of actions is performed.

plural of quarter of an hour

(Catholicism) A liturgy for daily use at each of the canonical hours obligatory to all Catholic bishops, priests, and transitional deacons and composed of psalms, hymns, and readings but lacking the eucharist.

plural of quarter-hour