Harmonious describes things that go well together, such as musical notes that sound pleasant or people who get along peacefully.
From Latin “harmonia” via Old French, meaning agreement, concord, or musical harmony. It ultimately goes back to a Greek word for “joint” or “fitting together.”
The root idea is literally “things that fit together,” which is why we can talk about harmonious colors, teams, or ideas—not just music. Harmony is less about being identical and more about being beautifully arranged.
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