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 ?
They died they died every man; and ere their bodies were cold, and ere their blood was dried, I had become the prey and the scorn of the conqueror
Stand back,'' said Rebecca ``stand back, and hear me ere thou offerest to commit a sin so deadly
Man does not appear to me to be intended to enjoy felicity so unmixed; happiness is like the enchanted palaces we read of in our childhood, where fierce, fiery dragons defend the entrance and approach; and monsters of all shapes and kinds, requiring to be overcome ere victory is ours.
Ere long she returned to a seat which I fancy she had but just quitted, or I should have caught sight of her before.
He had taken but a step, however, ere his quick ear caught the sound of approaching footsteps immediately without.
I tell thee, friend, one must serve a long apprenticeship ere one can learn to be even so much as a clapper-dudgeon, much less a crank or an Abraham-man.
Jerry's teeth were needles that stung, and Borckman, gaining the grasp on Jerry's jaw, flung him away and down so that almost he hit the Arangi's tiny-rail ere his clawing feet stopped him.
Yet, even after the enrolment, there was much to be done ere the party could proceed upon its way.
The foul wretch meant to divide, ere day came, the life of each from his body.
Slowly the sparkle point of consciousness and identity that was John Tarwater sank, deeper and deeper, into the profounds of his being that had been compounded ere man was man, and while he was becoming man, when he, first of all animals, regarded himself with an introspective eye and laid the beginnings of morality in foundations of nightmare peopled by the monsters of his own ethic- thwarted desires.
And verily, we spake and thought long enough together ere Zarathustra came home to his cave, for me not to be unaware that we ARE different.
The barriers of prejudice and religion were broken through by the irresistible power of the master-passion, and family unions, ere long, began to cement the political tie which had made a forced conjunction, between people so opposite in their habits, their educations, and their opinions.