dēcertātĭo, ōnis, f. [decerto],
the decision of a dispute, a decisive conflict or contest : rerum omnium, Cic. Phil. 11, 9, 21; cf. Cod. Theod. 7, 20, 2, § 2.
dēcertātiō ōnis, f decerto, a decisive struggle : rerum omnium consulibus commissa. ...
An Elementary Latin Dictionary