ἀντιφωνία

Alas! Could not find the search term ἀντιφωνία.
Found the closest form ἀντιφωνήσασα. Other nearby forms can be found in the wordwheel, or perhaps try searching again without accents.

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Parsed as:

✓ aorist active participle feminine nominative singular (morph21)
aorist active participle feminine vocative singular of ἀντιφωνέω