D defs.my
Entry 1 sense Webster, 1913

Improperia

· Im·pro·pe·ri·a · IPA
01 n. pl. A series of antiphons and responses, expressing the sorrowful remonstrance of our Lord with his people; -- sung on the morning of the Good …
  1. 1.
    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.(Mus.)