era


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era,

period of historic time. In geology, it is the name applied to large divisions of geological process, e.g., Paleozoic era (see geologygeology,
science of the earth's history, composition, and structure, and the associated processes. It draws upon chemistry, biology, physics, astronomy, and mathematics (notably statistics) for support of its formulations.
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). In chronology an era is a period reckoned from a fixed point in time, as before or after the birth of Christ—before Christ, B.C.; Anno Domini [year of the Lord], A.D. The points best known for Western history are the creation of the world (Jewish, equivalent to 3761 B.C.; Byzantine, 5508 B.C.); the founding of the city of Rome [753 B.C.; year marked A.U.C. for ab urbe condita (from the founding of the city)]; the HegiraHegira
or Hejira
[Ar.,=Hijra=breaking off of relations], the departure of the prophet Muhammad from Mecca in Sept., 622. Muhammad was a monotheist and preached against the polytheism of the Meccan religion.
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, the flight of Muhammad from Mecca (A.D. 622; abbreviation A.H.); and the founding of the Olympic games in ancient Greece (776 B.C.; time in Olympiads). Some people use C.E. (originally, Christian era, now common era) and B.C.E. (before common era) in place of A.D. and B.C., respectively. Since in different calendars years are of different lengths and do not begin on the same day (see calendarcalendar
[Lat., from Kalends], system of reckoning time for the practical purpose of recording past events and calculating dates for future plans. The calendar is based on noting ordinary and easily observable natural events, the cycle of the sun through the seasons with equinox
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), several factors have to be used in changing the year of one era to that of another, and even with conversion charts there are still difficulties. Because of poor time calculation in earlier times, there may be anomalies in dating. Thus, the beginning of the Christian era, originally fixed probably by Dionysius ExiguusDionysius Exiguus
, d. c.545, Roman monk, chronologist, and scholar, a transmitter of Greek thought to the Middle Ages. He made collections of 5th-century papal decretals and the canons of the early church councils.
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, was set a little too late. Therefore the actual birth of Jesus must be dated a little earlier, probably in 4 B.C. The term epochepoch,
unit of geologic time that is a subdivision of a period. The Pleistocene and Holocene epochs, for example, are divisions of the Quaternary period. Epoch is also used to describe a short length of geologic time during a special occurrence, such as the glacial epoch.
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 is often confused with era in writing.

Era

 

(1) In chronology, a fixed point in time that is connected with a real or legendary event and from which a series of years is reckoned. The term “era” is also applied to the system of chronological notation itself. The Christian era, or Common Era, for example, counts the years from a generally accepted date in the Christian religion: the birth of Christ. The peoples of ancient times used different eras that took as their starting point a real or mythical event or the founding of a ruling dynasty. The era of Nabonassar of Babylon, for example, began in 747 B.C.; in ancient Rome, time was reckoned from the founding of Rome (ab urbe condita), considered to have taken place in 753 B.C.; and the Muslim era (the Hegira) began in A.D. 622, the year in which, according to legend, Muhammad fled from Mecca to Medina.

Some eras are reckoned from a point in time chosen for astronomical reasons, which may be combined with religious considerations; examples include those systems that start from an assumed date of the creation of the world. In Judaism this date is 3761 B.C; in the Russian Orthodox Church it is 5508 B.C. In the same category is the Hindu Kali Yuga, which began in 3102 B.C. The Julian period, which was introduced at the end of the 16th century, provided a convenient system of reckoning for astronomical and chronological calculations; it began in 4713 B.C. (see and CALENDAR).

(2) A major historical period that differs fundamentally from the preceding period.

era

[′ir·ə]
(geology)
A unit of geologic time constituting a subdivision of an eon and comprising one or more periods.

ERA

era

Geology a major division of geological time, divided into several periods

ERA

(1)
Entity-Relationship-Attribute

era

(2)
Synonym epoch. Webster's Unabridged makes these words almost synonymous, but "era" usually connotes a span of time rather than a point in time.

ERA

(Electrically Reconfigurable Array) A programmable logic chip (PLD) technology from Plessey Semiconductor that allows the chip to be reprogrammed electrically.
References in classic literature ?
I read it as it came out week after week in the old National Era, and I broke my heart over Uncle Tom's Cabin, as every one else did.
My theory is that in a far distant era Caprona was a mighty mountain--perhaps the world's mightiest volcanic action blew off the entire crest, blew thousands of feet of the mountain upward and outward and onto the surrounding continent, leaving a great crater; and then, possibly, the continent sank as ancient continents have been known to do, leaving only the summit of Caprona above the sea.
The weird flora and fauna of Caspak were as possible under the thick, warm atmospheric conditions of the super-heated crater as they were in the Mesozoic era under almost exactly similar conditions, which were then probably world-wide.
Those few minutes marked to him an era in his official life.
This was a new era, and Daylight, the wealthy mine-owner, was loyal to his class affiliations.
A CONVENTION of female writers, which for two days had been stuffing Woman's couch with goose-quills and hailing the down of a new era, adjourned with unabated enthusiasm, shouting, "Place aux dames
It must have been a first model in the year one of the typewriter era.
This obscure reference applies to a blind negro musician who took the world by storm in the latter half of the nineteenth century of the Christian Era.
Near the top of this hill, about two miles from Linden-Car, stood Wildfell Hall, a superannuated mansion of the Elizabethan era, built of dark grey stone, venerable and picturesque to look at, but doubtless, cold and gloomy enough to inhabit, with its thick stone mullions and little latticed panes, its time-eaten air-holes, and its too lonely, too unsheltered situation, - only shielded from the war of wind and weather by a group of Scotch firs, themselves half blighted with storms, and looking as stern and gloomy as the Hall itself.
Every revolution was first a thought in one man's mind, and when the same thought occurs to another man, it is the key to that era.
It is with considerable difficulty that I remember the original era of my being; all the events of that period appear confused and indistinct.
Remember that the country is only just free from a long era of Conservative rule.