TRIODION - (Gr. three odes or modes). 1) A Liturgical book containing the hymns, prayers and services of the movable feast before Easter, beginning ten weeks before Easter with the Sunday of the Publican and the Pharisee, until Easter Sunday. This includes the four weeks proceeding Great Lent, Great Lent, and Holy (Passion) Week. 2) The period between the Sunday of the Publican and the Pharisee, and Cheese-Fare Sunday.