quasi purchas

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
QUASI PURCHASE. This term is used in the civil law to denote that a thing is 
to be considered as purchased from the presumed consent of the owner of the 
thing; as, if a man should consume a cheese, which is in his possession and 
belonging to another, with an intent to pay the price of it to the owner, 
the consent of the latter will be presumed, as the cheese would have been 
spoiled by keeping it longer. Wolff, Dr. de la Nat. Sec. 691. 
    

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