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  1. hour
  2. noun

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

      a two-hour operation an extra hour of daylight rates have ranged from $9 to $32 an hour
    • 2. a less definite period of time:

      during the early hours of the morning
    • 3. the distance traveled in one hour:

      Ocean City is less than an hour away
    • 4. a time of day specified as an exact number of hours from midnight or midday:

      the clock in the sitting room struck the hour
    • 5. a time specified on the 24-hour clock:

      the first bomb fell at 0051 hours
    • 6. the time as formerly reckoned from sunrise:

      it was about the ninth hour
    • 7. a fixed period of time for an activity, such as work, use of a building, etc.:

      the dinner hour shortened working hours
    • 8. a particular point in time:

      I wondered if my last hour had come
    • 9. (in the Western 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
    • 10. 15° of longitude or right ascension (one twenty-fourth part of a circle).

  3. Variation

    • n.: noun: hour, plural noun: hours

    • noun

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

      a more indefinite period of time:

    • noun

      a period of thirty minutes:

      a point in time thirty minutes after any full hour of the clock:

    • noun

      a period of fifteen minutes.

      a point of time fifteen minutes before or after any hour:

    • adjective

      lasting for one hour:
    • noun

      a period of the day when drinks are sold at reduced prices in a bar or restaurant.
    • noun

      an hour regarded in terms of the amount of work that can be done by one person within this period.
    • noun

      a measure of electrical energy equivalent to a power consumption of one watt for one hour.
    • noun

      the first hour after the occurrence of a traumatic injury, considered the most critical for successful emergency treatment.
    • noun

      a time during each day when traffic is at its heaviest:
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