horo-, hour-

(Greek > Latin: hour, time; period of time, season, any limited time)

Occurring every two hours.
encore (s) (noun), encores (pl)
1. A demand by an audience, as by applause, for an extra performance of a song, act, etc.: The presentation by the cellist was so fantastic when he played Bach’s Sonatas, that the listeners insisted on an encore and so the musician played an additional piece which was not on the program!
2. Etymology: used in the sense "again" from French, "again, still, yet"; said to be possibly from Latin hanc ad horam, "to this hour".
A demand for an additional performance as by applause.
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Writing about time and timekeeping instruments.
Any device used to tell the time; such as, a clock or sundial.
horologer (s) (noun), horologers (pl)
A person who repairs, makes, and/or sells watches and clocks: Jim wanted to become a horologer, or horologist, who is an expert in dealing with timepieces, so he had to study horology.
A vendor of instruments that tell what time it is.
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Of or pertaining to horology, or referring to time-keeping devices; such as, clocks and sundials.
1. A description of horologes or timepieces.
2. The art of constructing horologes.
1. Someone who studies the science of measuring time.
2. Someone skilled in making clocks and watches.
horology (s) (noun), horologies (pl)
1. The scientific subject area of how time is measured: Because Timothy was very interested in old watches, and had a collection of them, he bought a book on horology to find out more about years, months, days, hours, minutes, etc.
2. The art of making timekeeping instruments; such as, clocks and sundials: Since she was a little girl, Tina was fascinated by old pocket watches and so she decided to study horology and learn more about how time can be determined.
The science of measuring time or the skills of constructing various kinds of time-measuring devices.
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An instrument for measuring time.
The measurement of time; also, the determination of the exact error of a timepiece by observation.
1. The aspect of the planets and stars at a given moment, as the moment of a person's birth, used in astrology.
2. An astrologer's description of an individual's personality and future based on the position of the planets in relation to the sign of the zodiac under which the person was born.
3. A diagram of the heavens, showing the relative position of planets and the signs of the zodiac, for use in calculating births, foretelling events in a person's life, etc.
4. A prediction of future events or advice for future behavior based on the diagram described in the previous definition.
1. The making and interpretation of horoscopes.
2. The casting or taking of horoscopes.
Of or pertaining to evolution at a rate standard for a given group of plants or animals.
hour (s), hours (pl)
1. One of the 24 equal parts of a day.
2. One of the points on a timepiece marking off 12 or 24 successive intervals of 60 minutes, from midnight to noon and noon to midnight or from midnight to midnight.
3. The time of day as indicated by a 12-hour clock and the time of day determined on a 24-hour basis: 1730 hours is 5:30 p.m.
4. A unit of measure of longitude or right ascension, equal to 15° or 1/24 of a great circle.
5. A customary or fixed time; such as, "the dinner hour".
6. Etymology: from Old French hore, "one-twelfth of a day" (sunrise to sunset), from Latin hora, "hour, time, season"; from Greek hora. "any limited time"; referring to a day, hour, season, and year.

The Greeks borrowed the notion of dividing the day into hours from the Babylonians, but the Babylonian hour was one-twelfth of the whole day and therfore twice as long as a modern hour. The Greeks divided only the period of light into 12 parts, and the Romans adopted the system from them.

Night was not similarly divided until much later, and so the period of time covered by an hour varied according to the season.

In the 16th century, a distinction was sometimes made between temporary (unequal) hours and sidereal (equal) ones.