auditus

Latin auditus was the past participle and noun form of audire (to hear). It meant hearing, the act of listening, the faculty of perceiving sound. The Romans used auditus both for physical hearing and for judicial hearings — the formal listening of a magistrate to testimony. To audit someone was to hear them out, to give their words formal reception.

Medieval English and Latin used audit for the annual examination of accounts, when a lord or institution literally heard the accounts read aloud by the steward or bursar. The auditor sat as a listener while the account was recited; if the figures were satisfactory, the auditor acknowledged them. The oral presentation was the examination. Finance was conducted by voice before it was conducted by sight.

The shift from hearing to examining happened as literacy increased and written accounts became standard. By the 17th century an audit was primarily a written examination of financial records, though the auditor's role as formal listener-judge remained. Professional accounting firms developed in the 19th century as companies grew large enough to require independent verification.

Today's auditors rarely listen to anything — they examine spreadsheets, interrogate data systems, test internal controls. But auditing remains a fundamentally judicial act: an independent judgment on whether the accounts are true. The Latin audire persists in every board room where an audit committee convenes to hear what the numbers say.