The Collaborative International Dictionary
Feriae
Feria \Fe"ri*a\, n.; pl. Feri[ae]. (Eccl.)
A week day, esp. a day which is neither a festival nor a
fast.
--Shipley.
Wiktionary
feriae
n. (plural of feria English)
WordNet
feriae
See feria
feria
n. a weekday on which no festival or holiday is celebrated; "in the middle ages feria was used with a prefixed ordinal number to designate the day of the week, so `secunda feria' meant Monday, but Sunday and Saturday were always called by their names, Dominicus and Sabbatum, and so feria came to mean an ordinary weekday"
(in Spanish speaking regions) a local festival or fair, usually in honor of some patron saint
[also: feriae (pl)]