To audit a course, say at university, means to attend and perhaps do assignments but not pay fees nor receive credit for a course. It is often observed as someo

To audit a course, say at university, means to attend and perhaps do assignments but not pay fees nor receive credit for a course. It is often observed as someone "sitting in" on lectures without writing the final exam. Another usage is for supervising professors who attend a lecture to "audit" it in the sense that an IRS auditor would audit a tax return. They are examining the junior professor's performance or adherence to guidelines.