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Webster 1913 Edition

Improperia

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Imˊpro-pe′ri-a

,
Noun.
pl.
[L., 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.

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