vadati : [vad + a] speaks; says; tells.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Vadati [vad, Ved. vadati; Dhtp 134 vada=vacana] to speak, say, tell A iv.79; Sn 1037, 1077 sq.; Pug 42; PvA 13, 16, 39; Pot. 1st sg. vade (so read for vado?) M i.258; 3rd sg. vadeyya Pv i.33; aor. 3rd pl. vadiŋsu PvA 4. -- Cp. abhi˚, upa˚, pa˚, vi˚. -- Another form (not Caus.: see Geiger, P.Gr. § 1392) is vadeti Di.36; Vin ii.1; Sn 825; Sn p. 140 (kiŋ vadetha); J i.294; imper. vadehi PvA 62; Pot. med. 1st pl. vademase D iii.197; fut. vadessati Sn 351; aor. vadesi DhAiii.174. -- A specific Pāli formation is a Caus. vādiyati in act. and med. sense (all forms only in Gāthā style), e. g. indic. vādiyati Sn 824=892, 832; expld asvadati SnA 541, 542, or katheti bhaṇati etc. (the typical Niddesa expln of vadati: see Nd2 555) Nd1 161. In contracted (& shortened) form Pot. 2nd sg.vajjesi (*vādiyesi) you might tell, i. e. please tell Pv ii.116 (=vadeyyāsi PvA 149); iii.67 (same expln p. 203). The other Pot. forms from the same base are the foll.: 1st sg. vajjaŋ Th 2, 308; 2nd sg. vajjāsi Th 2, 307; J iii.272; vi.19; and vajja Th 2, 323; 3rd sg. vajjā Sn 971 (cp. Nd1 498); J vi.526 (=vadeyya C.); 3rd pl. vajjuŋ Sn 859 (=vadeyyuŋ katheyyuŋ etc. Nd2 555); J v.221. -- Caus. vādeti to make sound, to play (a musical instrument) J i.293; ii.110, 254 (vādeyyāma we might play); Ap 31 (aor. vādesuŋ); PvA 151 (vīṇaŋ vādento). -- Pass. vajjati (*vādiyati) to be played or sounded J i.13 (vajjanti bheriyo); Ap 31 (ppr. vajjamāna & aor. vajjiŋsu). <-> Another form of ppr. med. (or Pass.) is vadāna (being called, so -- called) which is found in poetry only (contracted fr. vadamāna) at Vin i.36=J i.83. -- pp. udita2 & vādita (q. v.). -- Caus. II. vādāpeti to cause to be played Mhvs 25, 74 (tūriyaŋ).

Pali-English Dictionary, TW Rhys Davids, William Stede,