Past tense of expatiate; spoke or wrote at length about something.
From expatiate plus the past tense suffix '-ed'. The verb expatiate developed in English in the 17th century from the Latin root.
If you've ever listened to someone expatiate—really get going on their favorite topic—you understand why this word feels like it's bouncing along. The double-'i' sound in '-iated' makes it sound expansive and energetic, which matches what people do when they're passionately elaborating.
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