grade inflation

noun Education.
  1. the awarding of higher grades than students deserve either to maintain a school's academic reputation or as a result of diminished teacher expectations.
  2. a rise in the average grade given to students.

Origin of grade inflation

First recorded in 1980–85
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British Dictionary definitions for grade inflation

grade inflation

noun
  1. 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