Jan 6, the twelfth day after Christmas and the feast of the Epiphany, formerly observed as the final day of the Christmas celebrations
b.
(as modifier)
Twelfth-Day celebrations
Twelfth-Day in British English
(ˈtwɛlfθˌdeɪ)
modifier
ecclesiastical
of or relating to January 6th, the twelfth day after Christmas and the feast of the Epiphany, formerly observedas the final day of the Christmas celebrations
Twelfth-Day celebrations
Twelfth Day in American English
the twelfth day (Jan. 6) after Christmas, traditionally the end of the Christmas season; Epiphany