- 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.
- 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
- a period of time considered in terms of noteworthy and characteristic events, developments, persons, etc.: an epoch of social revolution
- a point in time or a precise date
- Astron. the time at which observations are made, as of the positions of planets or stars
- Geol. a subdivision of a period in geologic time corresponding to the rock strata of a series ()
Origin: Midieval Latin epocha ; from Classical Greek epochē, a check, cessation ; from epechein, to hold inch(es) check ; from epi-, upon plush echein, to hold: see scheme
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- a. A particular period of history, especially one considered remarkable or noteworthy.b. A notable event that marks the beginning of such a period. See Synonyms at period.
- A unit of geologic time that is a division of a period.
- Astronomy An instant in time that is arbitrarily selected as a point of reference.
Origin: Medieval Latin epocha, measure of time, from Greek epokhē, a point in time; see segh- in Indo-European roots.
epoch - Computer Definition
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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epoch - Science Definition
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