Akademik

fast day
noun
a day designated for fasting
Hypernyms: ↑religious holiday, ↑holy day
Hyponyms: ↑major fast day, ↑minor fast day

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noun
Etymology: Middle English faste day, from faste fast + day — more at fast VI
: a day appointed for fasting and prayer often as a means of invoking the favor of God: as
a. capitalized : a day usually in the spring appointed by the magistrates and governors of some of the New England colonies and states as a holiday for the purpose of fasting and prayer
b. : such a legal holiday often in the summer observed in Scotland

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a day on which fasting is observed, esp. such a day appointed by some ecclesiastical or civil authority.
[1300-50; ME]

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fast day,
a day observed by fasting, especially a day regularly set apart by a church.

Useful english dictionary. 2012.