Ordinary Time (Latin: Tempus per annum) is the part of the liturgical year in the liturgy of the Roman Rite, which falls outside the two great seasons of Christmastide and Eastertide, or their respective preparatory seasons of Advent and Lent.
This block of Ordinary Time continues through the Tuesday that immediately precedes Ash Wednesday.
[5] In regional calendars where Whitmonday is a Day of Obligation, Ordinary Time and the use of the liturgical colour Green may begin on the following Tuesday.
As a mnemonic, if the First Sunday of Advent is in November, the previous liturgical year's Ordinary Time will have 33 weeks.
The solemnities, feasts, and commemorations of the General Roman Calendar which may, according to the Ranking of liturgical days in the Roman Rite, replace a Sunday of the Ordinary time are:[7] The Universal Norms on the Liturgical Year and the General Roman Calendar also lists as proper solemnities (which outrank in the relevant church building or community Sundays in Ordinary Time): Following the lead of the liturgical reforms of the Roman Rite, many Protestant churches also adopted the concept of an Ordinary Time alongside the Revised Common Lectionary, which applies the term to the period between Pentecost and Advent.
Those that have adopted the Revised Common Lectionary include churches of the Anglican, Methodist, Lutheran, Old Catholic and Reformed traditions.
This period can range anywhere from only the three Sundays prior to Christ the King (as in the Wisconsin Synod Lutheran) to 13 or 14 weeks (most notably in the United Methodist Church).