learning curve

noun
  1. Education. a graphic representation of progress in learning measured against the time required to achieve mastery.
  2. the process of learning upon which such a representation is based: Her new job has a steep learning curve.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for learning curve

learning curve

noun
  1. a graphical representation of progress in learningI'm still only half way up the learning curve
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