The quality of bubbling or boiling over; effervescence or exuberant enthusiasm.
From Latin 'ebullientia,' derived from 'ebullire' (to boil over), with '-ency' as a noun-forming suffix. The metaphorical meaning (enthusiasm) developed as the term was applied to emotional and intellectual overflow.
This word beautifully captures both physical boiling and emotional enthusiasm—when someone's 'ebulliency' shows, they're literally bubbling over with excitement.
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