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出典:Wiktionary
From the fact that Epiphany is the twelfth day after Christmas Day.
Twelfth Day (複数形 Twelfth Days)
出典:Wikipedia
出典:『Wikipedia』 (2009/12/28 13:50 UTC 版)
Twelfth Day is the twelfth and last day of the traditional Twelve Days of Christmas which follow Christmas Day. In western Christianity it falls on 6 January, which is also the feast of the Epiphany.
twelfth day