Related to or based on the belief that harmony or agreement is the fundamental principle of the universe or society.
From harmonist (one who believes in harmonious principles) + -ic suffix meaning 'of or relating to.' Harmonist comes from harmony, which derives from Greek harmonia meaning 'fitting together, agreement,' from harmozein 'to join, fit together.'
This word captures a whole philosophical movement—the Harmonists were real 19th-century communities that believed in perfect social cooperation, including the famous Harmony Society founded in Pennsylvania. They believed all human conflicts could be resolved through proper harmonious organization, which is kind of beautiful and kind of naive at the same time.
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