Definition of churn rate noun from the Oxford Advanced Learner's Dictionary

 

churn rate

 noun
noun
BrE
 
; NAmE
 
(business)
 
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the number of people who stop using a product and change to another or who leave the company they work for and go to another Analysts look at the churn rate on a quarterly basis. The phone company’s churn rate is down.
See the Oxford Advanced American Dictionary entry: churn rate