• Webster's Revised Unabridged Dictionary
    • n. pl Improperia (Mus) A series of antiphons and responses, expressing the sorrowful remonstrance of our Lord with his people; -- sung on the morning of the Good Friday in place of the usual daily Mass of the Roman ritual.
    • ***
Century Dictionary and Cyclopedia
    • improperia Antiphons and responses which on Good Friday are substituted for the usual mass of the Roman ritual. They are sung according to the revision of Palestrina in 1560 only in the Sistine Chapel at Rome, but to other plain-chant melodies in England and some parts of the continent of Europe.
    • ***


Webster's Revised Unabridged Dictionary
L., reproaches