period/ ˈpɪər i əd /
a rather large interval of time that is meaningful in the life of a person, in history, etc., because of its particular characteristics:
a period of illness; a period of great profitability for a company; a period of social unrest in Germany.
any specified division or portion of time:
poetry of the period from 1603 to 1660.
a round of time or series of years by which time is measured.
a round of time marked by the recurrence of some phenomenon or occupied by some recurring process or action.
(used by a speaker or writer to indicate that a decision is irrevocable or that a point is no longer discussable):
I forbid you to go, period.