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.
the point of completion of a round of time or of the time during which something lasts or happens.