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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.