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On ferias, feria 2, feria 3?
First of all the word feria comes from the Latin meaning free day.
Historically the term by which the Church has used for the days of the week has undergone several changes in itβs usage. The nuances of the term is not always completely clear either. Here is what the Catholic Encyclopedia has to say on this subject:
A day on which the people, especially the slaves, were not obliged to work, and on which there were no court sessions. In ancient Roman times the feriae publicae, legal holidays, were either stativae, recurring regularly (e.g. the Saturnalia), conceptivae, i.e. movable, or imperativae, i.e. appointed for special occasions. When Christianity spread, the feriae were ordered for religious rest, to celebrate the feasts instituted for worship by the Church. The faithful were obliged on those days to attend Mass in their parish church; such assemblies gradually led to mercantile enterprise, partly from necessity and partly for the sake of convenience. This custom in time introduced those market gatherings which the Germans call Messen, and the English call fairs. They were fixed on saints' days (e.g. St. Barr's fair, St. Germanus's fair, St. Wenn's fair, etc.)
Today the term feria is used to denote the days of the week with the exception of Sunday and Saturday. Various reasons are given for this terminology. The Roman Breviary, in the sixth lesson for 31 Dec., says that Pope St. Silvester ordered the continuance of the already existing custom "that the clergy, daily abstaining from earthly cares, would be free to serve God alone". Others believe that the Church simply Christianized a Jewish practice. The Jews frequently counted the days from their Sabbath, and so we find in the Gospels such expressions as una Sabbati and prima Sabbati, the first from the Sabbath. The early Christians reckoned the days after Easter in this fashion, but, since all the days of Easter week were holy days, they called Easter Monday, not the first day after Easter, but the second feria or feast day; and since every Sunday is the dies Dominica, a lesser Easter day, the custom prevailed to call each Monday a feria secunda, and so on for the rest of the week.
The ecclesiastical style of naming the week days was adopted by no nation except the Portuguese who alone use the terms Segunda Feria etc. The old use of the word feria, for feast day, is lost, except in the derivative feriatio, which is equivalent to our of obligation. Today those days are called ferial upon which no feast is celebrated. Feriae are either major or minor. The major, which must have at least a commemoration, even on the highest feasts, are the feriae of Advent and Lent, the Ember days, and the Monday of Rogation week; the others are called minor. Of the major feriae Ash Wednesday and the days of Holy Week are privileged so that their office must be taken, no matter what feast may occur.
Here follows an example of a medieval liturgical calendar, which may be helpful in understanding the above nuances.
Perhaps the oldest ecclesiastical calendar, in the proper sense of the word, which still survives, is the one which was in the possession of the Englishman St. Willibrord, Apostle of the Frisians, who has left in it an autograph note of the date of his consecration as bishop (A.D. 695). The calendar was probably written in England between 702 and 706. As it has never been printed it may be interesting to give here the entries made in the original hand, omitting the interpolations made by others at a slightly later date. The manuscript which contains it is the well-known "Codex Epternacensis", now Latin manuscript 10837, in the Bibliothèque Nationale, Paris.
January
1 Circumcision
3 St. Genevieve of Paris
6 Epiphany
13 St. Hilary
14 St. Felix of Nola
17 St. Anthony, Hermit
18 St. Peter's Chair at Rome and the Assumption of Holy Mary
20 St. Sebastian
21 St. Agnes (Virgin) 24 St. Babilas, Bishop and Martyr 25 Conversion of St. Paul at Damascus 29 St. Valerius, Bishop, and St. Lucy (Virgin) at Treves
February
1 St. Denis, St. Polycarp and St. Brigid (Virgin)
2 St. Symeon, Patriarch
5 St. Agatha
6 St. Amandus
16 St. Juliana
22 The Chair of Peter at Antioch
March
1 Donatus
7 Perpetua and Felicitas
12 St. Gregory at Rome
17 St. Patrick, Bishop in Ireland
20 St. Cuthbert, Bishop
21 St. Benedict, Abbot
25 The Lord was crucified and St. James the brother of Our Lord
27 The Resurrection of Our Lord
April
4 St. Ambrose
22 Philip, Apostle
May
1 St. Philip, Apostle
5 The Ascension of the Lord
7 The Invention of the Holy Cross
11 Pancratius, Martyr
14 Earliest date for Pentecost
31 St. Maximinius at Treves
June
2 Erasmus, Martyr
8 Barnabas, Apostle
9 St. Columkill
22 James the son of Alpheus
24 Nativity of John the Baptist
29 Sts. Peter and Paul at Rome
July
15 St. James of Nisibis
26 St. James, Apostle, Brother of John
26 St. Symeon, Monk in Syria
29 St. Lupus
August
1 The Machabees, seven brothers with their mother
5 St. Oswald, King
6 St. Syxtus, Bishop
10 St. Laurence, Deacon
13 Hippolitus, Martyr
16 (Sic) [erasure] St. Mary
25 St. Bartholomew, Apostle
28 Augustine and Faustinus, Bishops
29 Martyrdom of St. John the Baptist
31 St. Paulinus, Bishop at Trier
September
7 Sergius, Pope at Rome
9 (Sic) Nativity of St. Mary at Jerusalem
13 Cornelius and Cyprian
15 St. Euphemia, Martyr
19 Januarius. Martyr
21 Matthew, Apostle
22 Passion of St. Maurice
24 Conception of St. John the Baptist
27 Cosmas and Damian at Jerusalem
29 St. Michael, Archangel
October
1 Remedius and Germanus
4 Sts. Heuwald and Hewald, Martyrs
14 Paulinus, Bishop in Canterbury
18 Luke, Evangelist
28 Simon and Jude, Apostles
31 St. Quintinus, Martyr
November
10 St. Leo, Pope
11 St. Martin, Bishop at Tours
22 St. Cecilia
23 Clement at Rome
24 Crisogonus
30 St. Andrew, Apostle
December
10 St. Eulalia and seventy-five others
20 St. Ignatius, Bishop and Martyr
21 St. Thomas, Apostle in India
25 Nativity of Our Lord Jesus Christ
26 St. Stephen, Martyr
27 John, Apostle, and James, his brother
28 The Innocents
31 St. Silvester, Bishop
This list very well illustrates the arbitrary choice of saints to be commemorated, which is observable in most early calendars. The mention of the Nativity of our Lady on 9 September instead of 8 September is interesting in view of the Eastern practice, attested by the Naples marble calendar, of celebrating the Conception of Our Lady on 9 December. - Christian Calendar
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Andrew Hughes' 1982 book Medieval Manuscripts for Mass and Office: A Guide to Their Organization and Terminology explains it quite well at page 18.