learning curve

noun Education.
a graphic representation of progress in learning measured against the time required to achieve mastery.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
learning curve
a graphical representation of progress in learning: I'm still only half way up the learning curve

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Computing Dictionary

learning curve definition

A graph showing some measure of the cost of performing some action against the number of times it has been performed. The term probably entered engineering via the aircraft industry in the 1930s, where it was used to describe plots showing the cost of making some particular design of aeroplane against the number of units made.
The term is also used in psychology to mean a graph showing some measure of something learned against the number of trials. The psychology graphs normally slope upward whereas the manufacturing ones normally slope downward but they are both usually steep to start with and then level out.
Marketroids often misuse the term to mean the amount of time it takes to learn to use something ("reduce the learning curve") or the ease of learning it ("easy learning curve"). The phrase "steep learning curve" is sometimes used incorrectly to mean "hard to learn" whereas of course it implies rapid learning.
Engineering (http://computerworld.com/cwi/story/0,1199,NAV47-68-85-1942_STO61762,00.html).
Psychology (http://sun.science.wayne.edu/~wpoff/cor/mem/opereinf.html).
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
It's not easy and the learning curve can be expensive.
As the learning curve decreases, so does this form of chemical rewards from the
The learning curve and physical features change perhaps more rapid in order to
  help them adapt.
There is a learning curve and there are a lot of videos online that can help
  you learn it.
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