Definition of paradigm shift noun from the Oxford Advanced Learner's Dictionary

 

paradigm shift

 noun
noun
BrE
 
; NAmE
 
 
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a great and important change in the way something is done or thought about Wegener’s theory led to a paradigm shift in the earth sciences. I could convince only a few of my colleagues of the need for a revolution, a paradigm shift. Word Origin 1970s: term used in the writings of Thomas S. Kuhn (1922–96), philosopher of science.
See the Oxford Advanced American Dictionary entry: paradigm shift