conventio

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
CONVENTIO, canon law. The act of convening or calling together the parties, 
by summoning the defendant. Vide Reconvention. When the defendant was 
brought to answer, he was said to be convened, which the canonists called 
conventio, because the plaintiff and defendant met to contest. Sto. Eq. Pl. 
Sec. 402; 4 Bouv. Inst. n. 4117. 
    

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