vAdin a. [ vad-Rini ] 1 Speaking, talking, discoursing. 2 Asserting. 3 Disputing. — m. 1 A speaker. 2 A disputant, an antagonist; tasyAMgIkaraRena vAdina iva syAtsvAmino nigrahaH Mu. 5. 10 ; R. 12. 92. 3 An accuser, a plaintiff. 4 An expounder, a teacher. 5 (In music) The leading or key-note.