Definition of introit
1 often capitalized : the first part of the traditional proper of the Mass consisting of an antiphon, verse from a psalm, and the Gloria Patri
2 : a piece of music sung or played at the beginning of a worship service
Origin and Etymology of introit
Middle English, from Medieval Latin introitus, from Latin, entrance, from introire to go in, from intro- + ire to go — more at issue
First Known Use: 15th century
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