
The Improperia are a series of antiphons and responses, expressing the remonstrance of Jesus Christ with His people. They are also known as the `Reproaches`. In the Catholic liturgy they are sung as part of the observance of the Passion, usually on the afternoon of Good Friday. In the Byzantine Rite, they are found in various hymns of Good Frida.....
Found on
http://en.wikipedia.org/wiki/Improperia

• (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 Friday in place of the usual daily Mass of the Roman ritual.
Found on
http://thinkexist.com/dictionary/meaning/improperia/
Im`pro·pe'ri·a noun plural [ Latin , reproaches.]
(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.
Grove. Found on
http://www.encyclo.co.uk/webster/I/24

The improperia is a series of antiphons and responses, expressing the sorrowful remonstrance of Christ with his people. It is sung on the morning of Good Friday in place of the usual daily Mass of the Roman ritual.
Found on
http://www.probertencyclopaedia.com/browse/VI.HTM
No exact match found.