Definition from macmillandictionary.com
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The long dry period ended with torrential rain.
A decision has to be made within a period of three months.
They reached these conclusions in a relatively short period of time.
Their collection is confined solely to the Roman period.
This is described as the artist’s angry period.
They have another period of science this afternoon.
I realized I might be pregnant when I missed my period.
You are not going out tonight, period.