The OF Graduale Romanum, page 256, states that the Dominica Pentecostes mass shall be ended with: Ite missa est, alleluia, alleluia, as for the octave of Easter.
Does the same practice exist in the EF? Can you tell a few words about the history of the tradition of singing "alleluia" at the dismissal?
I think, rather, that it was intentional, drawing the parallel with Pentecost; Whitsunday (Pentecost) is so called because there were baptisms on the vigil of Pentecost, as at Easter, and the name is actually White-Sunday, referring to the white garments the baptized wore, like Low Sunday (Dominica in albis deponendis--Sunday for the laying aside the white garments}.
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