Lewis & Short

disquīsītĭo, ōnis, f. [disquiro], a (judicial) inquiry, investigation: in magnis disquisitionibus repentinisque periculis, *Cic. Sull. 28, 79; Liv. 8, 23; 26, 31; Tac. A. 3, 60; 5, 11; Suet. Caes. 15; id. Ner. 2.