In an antiphonical manner; through antiphonal singing or alternating responses.
From antiphonical + -ly (manner adverb). The double suffix -ical + -ly creates an adverbial form of the antiphonic adjective.
When something happens 'antiphonically,' it's describing a pattern that appears throughout nature—birds answering birds, heartbeats in sync, even conversations follow this ancient back-and-forth rhythm.
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