This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Plural form of period.

"Even regress is seen to be a necessary incident in progress, and the seasons which we call periods of decadence to be occasions in which the spirit progresses in secret, recruiting itself not by idleness or rest, but genuinely refreshing and recreating itself."