virtuous circle
noun/ˌvɜːtʃuəs ˈsɜːkl/
/ˌvɜːrtʃuəs ˈsɜːrkl/
(formal)- a series of events in which each one seems to increase the good effects of the previous one compare vicious circle
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virtuous circle
Definition of virtuous circle noun from the Oxford Advanced Learner's Dictionary