"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"
以上来源于: WordNet
N a weekday, other than Saturday, on which no feast occurs 平日 [RC Church]
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