Definition of introit in US English:

introit

noun

  • A psalm or antiphon sung or said while the priest approaches the altar for the Eucharist.

    • ‘Not just settings of the ordinary, but the copious amounts of plainchant needed to cover all the propers (the introit, gradual, alleluia, offertory, communion and other sentences, all of which change according to the day and festival).’
    • ‘The introit is my Deus in adjutorium written for the occasion and, even without trying it in the cathedral beforehand, it sounds glorious from the moment that Margaret's tenor solo rings out.’
    • ‘Messiaen's diary for that day recorded what must have been a memorable occasion: ‘I play an introit and sortie fortissimo, and improvise on themes by Berlioz.’’

Origin

Late Middle English (denoting an entrance or the action of going in): via Old French from Latin introitus, from introire ‘enter’, from intro- ‘to the inside’ + ire ‘go’.

Pronunciation