Definition of "ferial" [fe•ri•al]

• Pertaining to an ordinary weekday, rather than a festival or fast (adjective)
• Pertaining to a holiday (adjective)

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• "While readings, antiphons, or responses might be added to the margins of Psalters or incorporated into the text proper during the copying process, creating what was known as a ferial or choral Psalter, the Psalter itself remained the same, no matter who the user was."
• "It's also known as ferial time, a time without feasts."
• "Today those days are called ferial upon which no feast is celebrated."