Definition of phenomenal adjective from the Oxford Advanced Learner's Dictionary

  

phenomenal

 adjective
adjective
BrE BrE//ˈnɒmɪnl//
 
; NAmE NAmE//ˈnɑːmɪnl//
 
 
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very great or impressive synonym extraordinary The product has been a phenomenal success. The company has seen phenomenal growth. The response to the appeal has been phenomenal.Extra examples Exports have been phenomenal this year. He has a phenomenal memory for facts and figures. I learned a phenomenal amount. The leisure business has experienced phenomenal growth. The programme was a phenomenal success. There was a phenomenal response to the appeal.
See the Oxford Advanced American Dictionary entry: phenomenal