American English

Definition of substantially adverb from the Oxford Advanced American Dictionary

      

    substantially

     adverb
    adverb
    NAmE//səbˈstænʃəli//
     
     
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  1. 1very much; a lot synonym considerably The costs have increased substantially. The plane was substantially damaged in the crash. The company's profits have been substantially lower this year.
  2. 2(formal) mainly; in most details, even if not completely What she says is substantially true.
See the Oxford Advanced Learner's Dictionary entry: substantially