ep·och (?p?k, ?p?k) pronunciation
n.

    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.
  1. A unit of geologic time that is a division of a period.
  2. Astronomy. An instant in time that is arbitrarily selected as a point of reference.