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anytime at any moment, hour, or day; whenever. [1/2 definitions]
circadian denoting or concerning behavioral or physiological activities that recur at about twenty-four-hour intervals, such as sleep rhythms.
Circadian rhythm the approximately 24-hour cycle apparent in plants and animals that regulates hormone production, cell regeneration, sleeping and feeding patterns, and the like. [1/2 definitions]
cuckoo clock a clock that conceals a mechanical bird that pops out of a little door to announce the hour with sounds resembling the cry of a cuckoo.
daylight-saving time standard time that has been advanced by one hour in a given time zone, usu. in the spring and lasting into the fall, in order to provide one more hour of daylight at the end of each day.
dogwatch either of two two-hour watches aboard ship that occur between four and eight P.M.
DST abbreviation of "daylight saving time," standard time that has been advanced by one hour in a given time zone, usu. in the spring and lasting into the fall, in order to provide one more hour of daylight at the end of each day.
gale a strong wind, esp. one of about thirty to sixty miles per hour. [1/2 definitions]
half-hour thirty minutes after any hour, or an interval of thirty minutes. [1/4 definitions]
hour the distance that can be traveled in one hour. [1/5 definitions]
hourglass an instrument that measures time by channeling a quantity of sand or mercury through a narrow opening between two larger glass bulbs in exactly one hour. [1/2 definitions]
hourlong lasting an hour.
hourly done or occurring every hour. [3/5 definitions]
hr. abbreviation of "hour" or "hours," a unit of time equal to sixty minutes.
hurricane a powerful cyclonic storm that originates in the West Indian region of the Atlantic Ocean and that has heavy rains and winds exceeding seventy-three miles, or 119 kilometers, per hour.
kilowatt-hour a unit of electrical energy equal to one kilowatt operating for one hour. (abbr.: kwh, kWh)
knot1 one nautical mile, or about 6,080 feet, per hour. [1/14 definitions]
kwh abbreviation of "kilowatt-hour," or "kilowatt-hours," a unit of electrical energy equal to one kilowatt operating for one hour.
late of an advanced hour, esp. of the night or evening. [1/7 definitions]
light air in meteorology, a wind with a speed of between one and three miles per hour.
light breeze in meteorology, a wind with a speed of between four and seven miles per hour.