The Pali Text Society's Pali-English dictionary
Ovadati，[o + vadati．The Sk．avavadati is some centuries later and is diff．in meaning] to give advice，to admonish，exhort，instruct，usually combd． with anusāsati．-- pres．ovadati Vin．IV，52 sq．； DhA．I，11，13； imper．ovadatu M．III，267．-- pot．ovadeyya Vin．IV，52 （= aṭṭhahi garudhammehi ovadati）； Sn．1051 （= anusāseyya）．-- aor．ovadi DhA．I，397．-- inf．ovadituṃ Vin．I，59 （+ anusāsituṃ）．-- grd．ovaditabba Vin．II，5； and ovadiya （see sep．）．-- Pass．avadiyati； ppr．°iyamāna Pug．64 （+ anusāsiyamāna）．（Page 171）
Concise Pali-English Dictionary by A.P. Buddhadatta Mahathera
(ava + vad + a) gives advice; admonishes.
Pali-Dictionary Vipassana Research Institute
ovadati：To admonish，exhort，edify，advise，instruct