Definition of principally adverb from the Oxford Advanced American Dictionary

      

    principally

     adverb
    adverb
    NAmE//ˈprɪnsəpli//
     
     
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  1. 1mainly synonym chiefly
  2. 2 The book is aimed principally at beginners. No new power stations have been built, principally because of the cost.
See the Oxford Advanced Learner's Dictionary entry: principally