MOTU PROPRIO. Words used in rescripts drawn up and issued by a pope on his own initiative, and not conditioned by any petitionary requests. The documents are always signed personally by a pope.
See also PROPRIO MOTU.
PROPRIO MOTU. More commonly motu proprio. Something done on one's own initiative or by one's own will. Said especially of certain papal documents written on the Pope's own authority, often to meet a special and urgent need in the Church.