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Definition of prime mover noun from the Oxford Advanced Learner's Dictionary

prime mover

noun
 
/ˌpraɪm ˈmuːvə(r)/
 
/ˌpraɪm ˈmuːvər/
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  1. a person or thing that starts something and has an important influence on its development
    • With Germany, France has been the prime mover in closer European integration.
See prime mover in the Oxford Advanced American Dictionary
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