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Definition of the Richter scale noun from the Oxford Advanced American Dictionary

 

the Richter scale

 noun
noun
NAmE//ˈrɪktər ˌskeɪl//
 
[singular]
 
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a system for measuring how strong an earthquake is an earthquake measuring 7.3 on the Richter scale
See the Oxford Advanced Learner's Dictionary entry: the Richter scale