equivoca

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
EQUIVOCAL. What has a double sense.
     2. In the construction of contracts, it is a general rule that when an 
expression may be taken in two senses, that shall be preferred which gives 
it effect. Vide Ambiguity; Construction; Interpretation; and Dig. 22, 1, 4; 
Id 45, 1, 80; Id. 50, 17, 67. 
    

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