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



    BrE BrE//səbˈstænʃl//
    ; NAmE NAmE//səbˈstænʃl//
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  1. 1  large in amount, value or importance synonym considerable substantial sums of money a substantial change Substantial numbers of people support the reforms. He ate a substantial breakfast. There are substantial differences between the two groups. Their share of the software market is substantial. We were able to see a substantial improvement.
  2. 2  [usually before noun] (formal) large and solid; strongly built a substantial house a street of substantial Victorian villas
  3. Word OriginMiddle English: from Old French substantiel or Christian Latin substantialis, from substantia ‘being, essence’, from substant- ‘standing firm’, from the verb substare.
See the Oxford Advanced American Dictionary entry: substantial