effectĭo, ōnis, f. [efficio] (only in the philos. lang. of Cicero).
I A doing , performing , effecting , practising : artis, Cic. Fin. 3, 7, 24: recta (a transl. of κατόρθωσις), id. ib. 3, 14, 45.—*
II I. q. causa efficiens, the producing or efficient cause , Cic. Ac. 1, 2, 6.