The '''ordinary''', in [[Roman Catholic]] and other [[Latin liturgical ritesliturgy|WesternCatholic Christian]] [[liturgy|liturgies]], refers to the part of the [[Mass (liturgy)|Mass]] or of the [[canonical hours]]<ref>{{Cite web |title=Ordinary of the Divine Office |url=http://www.breviary.net/ordinary/ordin.htm |title=Ordinary of the Divine Office |accessurl-datestatus=2010-10-24dead |archive-url=https://web.archive.org/web/20101017130547/http://www.breviary.net/ordinary/ordin.htm |archive-date=2010-10-17 |urlaccess-statusdate=dead2010-10-24 |website=breviary.net}}</ref> that is reasonably constant without regard to the date on which the service is performed. It is contrasted to the ''[[Proper (liturgy)|proper]]'', which is that part of these liturgies that varies according to the date, either representing an observance within the [[liturgical year]], or of a particular [[saint]] or significant event, or to the ''[[Common (liturgy)|common]]'' which contains those parts that are common to an entire category of saints such as [[Apostles in the New Testament|apostles]] or [[martyr]]s.

In connection with liturgy, the term "ordinary" may also refer to [[Ordinary Time]] – those parts of the liturgical year that are neither part of the Easter cycle of celebrations (Lent and Eastertide) nor of the Christmas cycle ([[Advent]] and [[Christmastide]]), periods that were once known as "season after Epiphany" and "season after Pentecost".<ref>{{Cite web |title=All About Ordinary Time {{!}} Prayers, History, Customs, FAQ, Traditions, Images|url=http://www.churchyear.net/ordinary.html |websitearchive-url=https://web.archive.org/web/20200507154712/http://www.churchyear.net/ordinary.html |archive-date=2020-05-07 |access-date=2020-05-05 |website=ChurchYear.net}}</ref>

Also, the term "ordinary liturgy" is used to refer to regular celebrations of Christian liturgy, excluding exceptional celebrations.<ref>{{Cite book |last=Ottosen |first=Knud |title=Liturgy and the Arts in the Middle Ages: Studies in Honour of C. Clifford Flanigan |date=1996 |publisher=Museum Tusculanum Press |isbn=87-7289-361-3 |editor-last=Lillie |editor-first=Eva Louise |location=Copenhagen |page=[https://books.google.com/books?id=m2s5IvaV4JIC&dq=ordinary+liturgy&pg=PA168 168] |chapter=Liturgy as a Theological Place |quote="Liturgy in the broad sense covers all that was said or sung or performed in church in the past. However, I speak of liturgy in a more restricted sense of the word, limiting myself to the ''ordinary liturgy, such as the Liturgy of the Mass, the Rituals and the Liturgy of Hours''" ([https://booksemphasis added].google.com/books?id" |editor-last2=m2s5IvaV4JIC&pgPetersen |editor-first2=PA168&lpg=PA168&dq=ordinary+liturgy&source=bl&ots=eL6tgfFSQL&sig=owte4HRZLXq96q2XchUv3yD5QRw&hl=en&ei=84rCTJyVI4_KjAeM2vW5BQ&sa=X&oi=book_result&ct=result&resnum=2&ved=0CBYQ6AEwATge#v=onepage&q=ordinary%20liturgy&f=falseNils Liturgy and the arts in the Middle Ages, p. 168).]Holger}}</ref>

The '''Mass ordinary''' ({{lang-langx|la|'''Ordinarium Missae'''}}), or the ''ordinarium'' parts of the Mass, is the generally invariable set of texts of the [[Roman Rite]] [[Mass (liturgy)|Mass]] thataccording areto generally[[Latin invariableliturgical rites]] such as the [[Roman Rite]]. This contrasts with the [[proper (liturgy)|proper]] (''proprium'') which are items of the Mass that change with the feast or following the [[Liturgical Year]]. Ordinary of the Mass may refer to the ''ordinarium'' parts of the Mass or to the [[Order of Mass]] (which includes the proprium parts).

[[Gloria in Excelsis Deo|Gloria]] ("Glory to God in the highest"). The ''Gloria'' is reserved for Masses of Sundays, solemnities, and feasts, with the exception of Sundays within the penitential season of [[Lent]] (to which, before 1970, were added the [[Ember Days]] occurring four times a year, and the pre-Lenten season that began with [[Septuagesima]]), and the season of [[Advent]] (when it is held back as preparation for Christmas). It is omitted at weekday Masses (called [[feria]]s) and memorials, and at requiem and votive Masses, but is generally used also at ritual Masses celebrated on occasions such as the administration of another sacrament, a religious profession or the blessing of a church. On May 22, 2019, Pope Francis altered part of the Gloria in Italy, changing from "Peace on earth to people of goodwill" to "Peace on Earth to people beloved by God."<ref name="Gloriachange">{{Cite web |date=2019-06-03 |title=Pope Francis Approves Changes to Lord's Prayer & Gloria of Italian Missal |url=https://ucatholic.com/news/pope-francis-approves-changes-to-lords-prayer-gloria-of-italian-missal/ |last=uCatholic|access-date=20192020-0605-0305 |website=uCatholic |language=en-US|access-date=2020-05-05}}</ref> The changes, which were first approved by the General Assembly of the Episcopal Conference of Italy, are part of the third edition of the [[Roman Missal]].<ref name="Gloriachange" /><ref>{{Cite web |date=2019-05-31 |title=Francis approvesApproves revisedRevised translationTranslation of Italian Missal – La Croix International|url=https://international.la-croix.com/news/francis-approves-revised-translation-of-italian-missal/10234|website=international.la-croix.com |access-date=2020-05-05 |website=La Croix International}}</ref>

The ordinary of the [[canonical hours]] consists chiefly of the [[psalter]], an arrangement of the [[Psalms]] distributed over a week or a month. To the psalter are added [[canticle]]s, [[hymn]]s, and other prayers.