ORDINARY TIME: Ordinary time covers the weeks of the year which do not have a seasonal focus. There are two periods of ordinary time: between Epiphany and Lent (the Sundays before Lent), and between Pentecost and Advent (the Sundays after Trinity). 
The word “ordinary” commonly means something that is unexceptional or uninteresting. However, the word “ordinary” as used in “Ordinary Time” means that the Sundays after the seasons of Christmas and Easter are counted in order, using ordinal numbers.
It is best to think of Ordinary Time as one of the liturgical seasons – the longest season of the church year. Its liturgical colour of green points to our Christian hope and life, entering into the mystery of Christ in all its fullness.

Each year during Ordinary Time we read through one of the Gospels. This year (2020) we read cycle A which concentrates on readings from the Gospel of St. Matthew. The next year we turn to Cycle B the focus of which is St. Mark's Gospel, and the third year we turn to readings from St. Luke's Gospel until we repeat the cycle again. The two testaments, Old and New Testaments, reveal God's divine plan for mankind: "It is on this harmony of the two Testaments that the Paschal catechesis of the Lord is built, and then, that of the Apostles and the Fathers of the Church ..." (CCC 1094). The Church in her wisdom teaches that the Liturgy reveals the unfolding mystery of God's plan as we read the Old Testament in light of the New and the New Testament in light of the Old.

Ordinary Time enables us to devote ourselves to exploring the mystery of Christ in all its aspects and to celebrate the presence of God in the ordinary patterns of human life.

(Ref. "Liturgy Brisbane", "Agape Bible Study")

Ordinary Time - Before Lent (from 13 January, day after Baptism of the Lord, to 25 February, day before Ash Wednesday)