epoch - Dictionary definition and pronunciation - Yahoo! Education
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ep·och  audio  (pk, pk) KEY 

NOUN:
    1. A particular period of history, especially one considered remarkable or noteworthy.
    2. A notable event that marks the beginning of such a period. See Synonyms at period.
  2. A unit of geologic time that is a division of a period.
  3. Astronomy An instant in time that is arbitrarily selected as a point of reference.
ETYMOLOGY:
Medieval Latin epocha, measure of time, from Greek epokh, a point in time; see segh- in Indo-European roots


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