Relating to or occurring on a feria; designating a weekday in the Christian liturgical calendar that is not a major feast day.
From Latin 'ferialis' (of or belonging to a holiday), derived from 'feria' (weekday, holiday), with the adjectival suffix '-al' meaning 'of or pertaining to.'
Catholic liturgy still uses 'ferial' masses on regular weekdays—it's a linguistic fossil showing how medieval religious calendars built vocabulary that persists in modern religious practice.
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