Accordingly, in actual liturgical practice a feria or ferial day is "a weekday on which no special ecclesiastical feast is to be celebrated".
"[4] Since in ecclesiastical Latin the names of Sunday and Saturday do not contain the word feria and are called respectively dominica and sabbatum, some use the term feria "to denote the days of the week with the exception of Sunday and Saturday",[5] in spite of the official definition given above and the actual usage in official liturgical books.
The Roman Rite no longer distinguishes different classes of ferias (weekdays) as in the 1960 Code of Rubrics of Pope John XXIII, but it attributes different positions to them in ranking liturgical days.
In the Table of Liturgical Days according to their order of precedence, attached to the Universal Norms on the Liturgical Year and the Calendar,[6] Ash Wednesday and weekdays of Holy Week from Monday up to and including Thursday are outranked only by the Paschal Triduum, the four solemnities of Christmas, Epiphany, Ascension and Pentecost, and the Sundays of Advent, Lent, and Easter.
In addition, the major ferias of Ash Wednesday and Holy Week were privileged: these liturgies were to be celebrated no matter what feast happened to occur on those days.