Epoch

ep′ok, or ē′-, n. a point of time fixed or made remarkable by some great event from which dates are reckoned: a period remarkable for important events: ( astron. ) the mean heliocentric longitude of a planet in its orbit at any given time.— adjs. Ep′ochal ; Ep′och-mā′king .— Make , Mark, an epoch , to begin an important era. [Gr. epochē — epechein , to stop— epi , upon, eche in , to hold.]