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Definition of Copernican system noun from the Oxford Advanced Learner's Dictionary

 

Copernican system

 noun
noun
BrE BrE//ˈpɜːnɪkən sɪstəm//
 
; NAmE NAmE//ˈpɜːrnɪkən sɪstəm//
 
[singular]
 
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the theory that the sun is the centre of the solar system, with the earth and other planets moving around it compare Ptolemaic system Word Origin mid 17th cent.: named after Copernicus (1473-1543), the Polish astronomer.
See the Oxford Advanced American Dictionary entry: Copernican system