In an antiphonal manner; through alternating responses or chants; with one voice or group answering another.
From antiphonal + -ly (manner adverb). This creates an adverbial form describing how something is done in the antiphonal style.
When you speak 'antiphonally,' you're engaging in one of humanity's oldest communication patterns—the call-and-response that shows up in conversation, music, and even DNA transcription.
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