Definition of chiefly adverb from the Oxford Advanced American Dictionary

     

    chiefly

     adverb
    adverb
    NAmE//ˈtʃifli//
     
     
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  1. 1not completely, but as a most important part synonym primarily, mainly
  2. 2 We are chiefly concerned with improving educational standards. He's traveled widely, chiefly in Africa and Asia.
See the Oxford Advanced Learner's Dictionary entry: chiefly