More on Motu Proprio from Infoplease:

• motu proprio: meaning and definitions - motu proprio: Definition and Pronunciation
• Motu Proprio - Motu Proprio A law brought in by Consalvi, to abolish monopolies in the Papal States (1757). ...
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• Dictionary of Phrase and Fable: M - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "M"