attĕnŭātĭo (adt-), ōnis, f. [attenuo],
a diminishing , lessening (only in the two foll. exs.): attenuatio suspitionis, Auct. ad Her. 2, 2: verborum attenuatio, simplicity , id. ib. 4, 11; cf. attenuatus.
attenuātiō (adt-) ōnis, f a lessening: suspitionis, Her. ...
An Elementary Latin Dictionary