Teacher checking off a passing grade.
The definition of pass fail refers to a grading system in which students receive wither a "pass" or "fail" grade.
An example of a pass fail class is one where you either complete it properly and get credit or where you don't; but, either way, no grades are assigned.
Educ. of or designating a grading system in which “pass” or “fail” is recorded instead of a numerical or letter grade: a pass-fail course
such a grading system
Of, relating to, or being a system of grading in which a student simply passes or fails instead of receiving a traditional letter grade: a pass-fail course.
This kind of a grading system.