contemporaneous exposition

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
CONTEMPORANEOUS EXPOSITION. The construction of a law, made shortly after 
its enactment, when the reasons for its passage were then fresh in the minds 
of the judges, is considered as of great weight: contemporanea expositio est 
optima et fortissima in lege. 1 Cranch, 299. 
    

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