APÒDOSI (ἀπόδοςις). — It is the deposition, or conclusion, of a feast prolonged over several days. In the Byzantine rite, in fact, the principal feasts are commemorated for a certain number of days and end with the repetition of their offices. The number of days celebrated is not fixed, as in the Roman rite (octave), but varies according to the feasts and their coincidences with other commemorations. The movable feasts of the Paschal season also have their apodosis. Easter itself is fixed on the vigil of the Ascension. The Sundays between Easter and Ascension have an apodosis after two or three days.
Placido De Mecster