a period of time equal to a twenty-fourth part of a day and night and divided into 60 minutes

an extra hour of daylight in the winter evenings

rates of pay were low, starting at £3.20 an hour

a two-hour operation

a time of day specified as an exact number of hours from midnight or midday

the clock in the sitting room struck the hour

a fixed period of time for an activity, such as work, use of a building, etc.

the dinner hour

licensing hours

opening hours

(in the Western (Latin) Church) a short service of psalms and prayers to be said at a particular time of day, especially in religious communities

an organized life of prayer including the canonical hours

15° of longitude or right ascension (one twenty-fourth part of a circle)