A weekday in the Christian calendar that is not a feast day, or more broadly, a fair or festival, especially a market fair.
From Latin 'feria' (weekday, originally meaning 'holiday' or 'day of rest'), derived from 'feriae' (holidays, festival days), possibly connected to 'festus' (festive).
In Spanish and Portuguese, 'feria' evolved to mean 'fair' or 'market festival'—so the word traveled from 'rest day' in Rome to 'market day' in medieval towns, showing how religious calendars shaped commerce.
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