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quarter of an hour 15 minutes , quarter-hour
half of an hour 30 minutes , half-hour
unit of energy equal to the work done by a power of 1000 watts operating for one hour B.T.U. , Board of Trade unit , kilowatt hour , kW-hr
(nautical) each of the eight half-hour units of nautical time signaled by strokes of a ship's bell; eight bells signals 4:00, 8:00, or 12:00 o'clock, either a.m. or p.m. bell , ship's bell
customary or habitual hour for eating breakfast breakfast time
(astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and celestial longitude , RA , right ascension
eleventh-hour effort to complete something charrette
twenty-four hour occurrence or cycle circadian
bodily processes 24-hour rhythm circadian rhythm
canonical hour just before bedtime compline
unit of academic credit; one hour a week for an academic semester credit hour , semester hour
time during which clocks are set one hour ahead of local standard time; widely adopted during summer to provide extra daylight in the evenings daylight-savings time , daylight-saving time , daylight saving , daylight savings
customary or habitual hour for the evening meal dinnertime , suppertime
hour early in the morning early-morning hour
cocktail hour happy hour
hour, concerning an horary
unit of work equal to the work done by one horsepower in one hour horsepower-hour
angular distance along the celestial equator from the observer's meridian to the hour circle of a given celestial body hour angle
person who stays in bed until a relatively late hour lie-abed , slugabed
distance light travels in a vacuum in one hour; approximately one billion kilometers light hour
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