Definition of comfort zone noun from the Oxford Advanced Learner's Dictionary

     

    comfort zone

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1(sometimes disapproving) a place or situation in which you feel safe or comfortable, especially when you choose to stay in this situation instead of trying to work harder or achieve more Stepping outside your comfort zone and trying new things can be a great experience. We cannot afford to have anyone operating in a comfort zone. I’ll tell you what drives me crazy—people who have talent but cruise along in the comfort zone.
  2. 2(approving) (especially in sport) a state in which you feel confident and are performing at your best I knew if I could find my comfort zone I would be difficult to beat.
See the Oxford Advanced American Dictionary entry: comfort zone