Definition of all- combining form from the Oxford Advanced Learner's Dictionary

     

    all-

     combining form
    combining form
    BrE BrE//ɔːl//
     
    ; NAmE NAmE//ɔːl//
     
    (in adjectives and adverbs)
     
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  1. 1completely an all-British cast an all-inclusive price
  2. 2in the highest degree all-important all-powerful
See the Oxford Advanced American Dictionary entry: all-