the anniversary of the day (December 21, 1620, in Old Style December 11) on which the Pilgrims landed at Plymouth, Mass. Owing to an error in changing the date from the Old Style to the New, it is generally observed on December 22.
[ 1820-30 ]
FOREFATHERS' DAY
Meaning of FOREFATHERS' DAY in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012