Definition of harmonious adjective from the Oxford Advanced American Dictionary

     

    harmonious

     adjective
    adjective
    NAmE//hɑrˈmoʊniəs//
     
     
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  1. 1(of relationships, etc.) friendly, peaceful, and without any disagreement a harmonious alliance between management and workers opposite inharmonious
  2. 2arranged together in a pleasing way so that each part goes well with the others synonym pleasing a harmonious combination of colors opposite inharmonious
  3. 3(of sounds) very pleasant when played or sung together
harmoniously
 
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adverb They worked very harmoniously together.
See the Oxford Advanced Learner's Dictionary entry: harmonious