success rate

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Also see: rate

Concise Oxford English Dictionary © 2008 Oxford University Press:
success/səkˈses/

▶noun

• 1 the accomplishment of an aim or purpose.

  ■ the attainment of fame, wealth, or social status.

  ■ a person or thing that achieves success.

• 2 archaic the good or bad outcome of an undertaking.

– origin C16: from L. successus, from succedere (see succeed).