Academic audit - Wikipedia
https://en.wikipedia.org/wiki/Academic_audit
In academia, an audit is an educational term for the completion of a course of study for which no assessment of the performance of the student is made nor grade awarded. Some institutions may record a grade of "audit" to those who have elected not to receive a letter grade for a course in which they are typically awarded. In this case, 'audit' indicates that the individual merely has received teaching, rather than being …
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