fiducia

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
FIDUCIA, civil law. A contract by which we sell a thing to some one, that 
is, transmit to him the property of the thing, with the solemn forms of 
emancipation, on condition that he will sell it back to us. This species of 
contract took place in the emancipation of children, in testaments, and in 
pledges. Poth. Pand. h.t. 
    

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