the awarding of higher grades than students deserve either to maintain a school's academic reputation or as a result of diminished teacher expectations.
a rise in the average grade given to students.
Origin of grade inflation
First recorded in 1980–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for grade inflation
an apparently continual increase in numbers of students attaining high examination grades, or the practice of awarding grades in this way
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012