Dictionary Definition:
Saddahati [Vedic śrad -- dhā, only in impers. forms grd. śrad -- dadhāna; pp. śrad -- dhita; inf. śrad -- dhā; cp. Av. ƶraƶ -- dā id.; Lat. cred -- (d)o (cp. "creed"); Oir. cretim to believe. Fr. Idg. *kred (=cord˚ heart)+*dhe, lit. to put one's heart on] to believe, to have faith D ii.115; 244; S iii.225; Pv ii.83; J v.480; DhA ii.27. ppr saddahanto DA i.81; PvA 148 (a˚), 151 (a˚), 285; & saddahāna S i.20, 214; Sn 186; It 112. Pot. saddheyya J ii.446 (=saddaheyya C.); 2nd pl. saddahetha J iii.192; 3rd pl. saddheyyuŋ S ii.255. At J vi.575 (Pot.) saddahe seems to be used as an exclamation in the sense of "I wonder" (cp. maññe). -- saddahase at Pv iv.81 is to be read saddāyase (see saddāyati). -- grd. saddhātabba J ii.37; v.480; PvA 217; saddahātabba D ii.346; saddahitabba Miln 310; saddheyya Vin iii.188; and saddhāyitabba (Caus.!) PvA 109. A Caus. aor. 2 sg. is (mā) . . . saddahesi J vi.136140 -- ger. saddhāya J v.176 (=saddahitvā C.); inf. saddhātuŋ J v.445. <-> pp. (Caus.) saddhāyita. -- Caus. II. saddahāpeti to make believe, to convince; Pot. ˚dahāpeyya J vi.575; Pv iv.125; fut. ˚dahāpessati J i.294.