periods

1.

미문

a length or portion of time.

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he had long periods of depression
:
timespellintervalstretchtermspanphasesessionboutrunspacedurationchapterstagewhilepatch
2.

미문

the interval of time between successive occurrences of the same state in an oscillatory or cyclic phenomenon, such as a mechanical vibration, an alternating current, a variable star, or an electromagnetic wave.

:
periodperiodicallyperiodicperiodicalincubation periodperiod piecefree period