auditor

The word 'auditor' originates from the Latin verb audire, meaning "to hear." In ancient Rome, an auditor was literally a listener, such as a pupil or a person who heard accounts. This evolved because official financial examinations were historically conducted orally, where accounts were read aloud for verification. The suffix -or, denoting an agent, was attached to form a noun for the person performing this act of listening. Over time, as written records became standard, the role shifted from an oral listener to an examiner of documents, yet the original sense of careful, attentive review remains embedded in the modern professional title.

Structure: audit (hear) + or (agent suffix) audit (from Latin audire, meaning "to hear"); or (from Latin -or, an agent noun suffix indicating "a person who does something").