Epoch meaning

ĕpək, ēpŏk
Frequency:
Epoch is defined as an important period in history or an era.

An example of an epoch is the adolescent years.

An examplf of an epoch is the Victorian era.

noun
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A particular period of history, especially one considered remarkable or noteworthy.
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The beginning of a new and important period in the history of anything.

The first earth satellite marked a new epoch in the study of the universe.

noun
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A particular period of history, especially one considered remarkable or noteworthy.
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A period of time considered in terms of noteworthy and characteristic events, developments, persons, etc.

An epoch of social revolution.

noun
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A point in time or a precise date.
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A unit of geologic time that is a division of a period.
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A notable event which marks the beginning of such a period.
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The time at which observations are made, as of the positions of planets or stars.
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The starting date from which time is measured as a number of days or minutes or seconds, etc. In computer applications, epochs are used to maintain a time reference as a single number for ease of computation. Otherwise, depending on the granularity of time desired, every point in time would have to be stored with some of or all of the components of the time hierarchy, including year, month, day, hour, minute, second, millisecond, microsecond and nanosecond. Following are the various epochs in use. See also EPOC.System Epoch Measured in Unix/Linux Jan. 1, 1970 Seconds Java Jan. 1, 1970 Milliseconds Windows files Jan. 1, 1601 Ticks (100 ns) Windows dates Jan. 1, 0001 Ticks (100 ns) Mac Jan. 1, 2001 Seconds Earlier Mac Jan. 1, 1904 Seconds Excel Dec. 31, 1899 Days DB2 Dec. 31, 1899 Days Unununium Jan. 1, 2000 Microseconds.
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(astronomy) A precise instant of time that is used as a reference point.
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(computing, uncountable) A precise instant of time that is used as a reference point (e.g. January 1, 1970, 00:00:00 UTC).
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A subdivision of a period in geologic time corresponding to the rock strata of a series.
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The shortest division of geologic time . An epoch is a subdivision of a period.
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An instant in time that is arbitrarily selected as a point of reference for specification of celestial coordinates.
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Origin of epoch

  • Medieval Latin epocha measure of time from Greek epokhē a point in time segh- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Medieval Latin epocha, from Ancient Greek ἐποχή (epokhē, “a check, cessation, stop, pause, epoch of a star, e.g., the point at which it seems to halt after reaching the highest, and generally the place of a star; hence, a historical epoch”), from ἐπέχειν (epechein, “to hold in, check”), from ἐπί (épí, “upon”) + ἔχειν (echein, “to have, hold”).

    From Wiktionary