Definition of "effervescency" [effervescency]

• Effervescence (noun)

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• "Cockshot is bottled effervescency, the sworn foe of sleep."
• "This being all that I could think of, I relaxed from these grave considerations; whereupon my mind bubbled at once into an effervescency of pleasing spirits, and it was like one treading on air that I turned homeward."
• "The effervescency of her passionate and irritable nature rose within her at times to bursting point."