The division or arrangement of weekdays in the Christian liturgical calendar, or the act of distributing days among feast days and ordinary ferias.
From Latin 'feria' (weekday) combined with the abstract noun suffix '-tion' (derived from Latin '-tio'), referring to the systematic organization of the religious calendar.
Medieval monks developed incredibly complex feriation systems to ensure that major saints' days didn't conflict—it was like solving a celestial scheduling puzzle that determined prayer practices for millions.
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