After the close of the Christmas season with the Feast of the Baptism of the Lord, the season of Ordinary Time begins. Although the colloquial meaning of “ordinary” does apply here, since Ordinary Time is “everything outside the festal seasons of Advent, Christmas, Lent, and Easter,” the term actually derives from the Latin word meaning ordinal or counted time.
The liturgical color for Ordinary Time is green: so we’ll see green altar cloths and priestly vestments.
Every year, shortly after Ordinary Time begins, it is interrupted by the seasons of Lent and Easter. Because the date of Easter varies each year, we get a small but varying number of weeks of Ordinary Time before Lent begins on Ash Wednesday.