pure debt

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
PURE DEBT. In Scotland, this name is given to a debt actually due, in 
contradistinction to one which is to become due at a future day certain, 
which is called a future debt: and one due provisionally, in a certain 
event, which is called a contingent debt. 1 Bell's Com. 315, 5th ed. 
    

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