Har·mo·ni·ous a.
 1. Adapted to each other; having parts proportioned to each other; symmetrical.
    God hath made the intellectual world harmonious and beautiful without us.   --Locke.
 2. Acting together to a common end; agreeing in action or feeling; living in peace and friendship; as, an harmonious family.
 3. Vocally or musically concordant; agreeably consonant; symphonious.
 -- Har*mo*ni*ous*ly, adv. -- Har*mo*ni*ous*ness, n.

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 harmoniousness
      n 1: the property of sounding harmonious [syn: consonance]
      2: compatibility in opinion and action [syn: harmony]