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.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

era

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

ERA

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

era

Geology a major division of geological time, divided into several periods
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

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.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

ERA

(Electrically Reconfigurable Array) A programmable logic chip (PLD) technology from Plessey Semiconductor that allows the chip to be reprogrammed electrically.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
(18) Salomon 2005: 369: "Ultimately, the strongest point in favor of the equation of the Azes and Vikrama eras is that, if it is not accepted, we are left without a good explanation of the historical origin of the latter in 58/7 B.C."; cf.
The less crucial explanation is that most of the Arab countries chose to side with the Socialist bloc in the Cold War era. If one goes into detail regarding the shaping of the Turkish mental map towards the Arabs, it is not possible to find a serious enmity until the mid-1910s.
Relative to league performance, Pedro Martinez's ERA is the best of the past hundred years.
IP H R ER BB K 18.0 14 5 4 5 14 An ERA is calculated by multiplying the number of earned runs by nine.
These groups argued that the state policy violated several provisions of the New Mexico Constitution, including the state ERA, which was adopted in 1973.
This belief is exemplified in the National Association of Colored Women's Club's motto, "Lifting as We Climb." Philip Jackson has established that the proliferation of black charities in the Progressive Era was in part the product of a striving of the Black middle class for legitimation by white society.(6) Both Meier and Jackson have observed that the predominant black social welfare institution shifted from the self-help programs of clubs and churches in the Progressive Era to the more formal and professional Urban League in the pre-Depression era.(7) This paper argues that this shift was in part engineered by the nascent social work profession.
Some Arizona lawmakers are trying to revive the effort to ratify the ERA, which would purportedly eliminate sex discrimination in the law.
208, based on the odd notion that passing such a resolution could somehow revive the long-expired ERA. Moreover, she proposes that this may be accomplished by simple majority votes in Congress, not the two-thirds votes that were required for approval of H.J.
Winnipeg, Canada, January 31, 2016 --(PR.com)-- The Electronic Recycling Association (ERA) has been active in Winnipeg and area since early 2015.