/ Dictionary / Index O onus probandi*: Meaning and Definition of Find definitions for: o•nus pro•ban•di Pronunciation: (ō'noos prō-bän'dē Eng. ō'n&schwas prō-ban'dī, -dē), [key] — Latin. Latin. the burden of proof. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. onus onward Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language