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Old English ān (cognate)
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Old Church Slavonic ѥдинъ (cognate)
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Ancient Greek οἶος (cognate)
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Proto-Indo-European *óynos (inherited)
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Old Latin oinos (inherited)
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Proto-Italic *oinos (inherited)
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Old Irish óen (cognate)
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Corsican un (inherited)
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Corsican unu (inherited)
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Scottish Gaelic aon (cognate)
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Galician uni- (derived)
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Neapolitan 'nu (inherited)
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Romansch ün (inherited)
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Romanian unui (mention)
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Bourguignon ein (inherited)
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Venetian uno (inherited)