Agreement or concord.

noun [ HAR-muh-nee ]

A state of agreement, peace, and mutual understanding between people or groups.

• 🖊️  In the quiet of the morning, the birds sang in harmony.
• 🖊️  The orchestra played in perfect harmony, each note a testament to their unity.
• 🖊️  If nations could find harmony, wars would be a relic of the past.
• 🤝  accord, concord, unity
• ⚔️  discord, conflict, dissonance

Musical chords.

noun [ HAR-muh-nee ]

The combination of simultaneously sounded musical notes to produce a pleasing effect.

• 🖊️  If there were more harmony in the world, perhaps wars would be a thing of the past.
• 🖊️  In the quiet of the night, the crickets' song created a harmony that lulled me to sleep.
• 🖊️  When the orchestra played, the harmony of the strings and brass was nothing short of magical.
• 🤝  chord, consonance, melody
• ⚔️  cacophony, dissonance

Internal consistency.

noun [ HAR-muh-nee ]

A pleasing arrangement of parts, often in art, design, or nature, resulting in a coherent whole.

• 🖊️  The harmony of the orchestra was disrupted by a single off-key note.
• 🖊️  In the quiet of the morning, the birds sang in perfect harmony.
• 🖊️  If nations could find harmony, wars would be a relic of the past.
• 🤝  balance, proportion, symmetry
• ⚔️  imbalance, disarray

Compatibility or agreement.

noun [ HAR-muh-nee ]

A state in which different elements are combined in a way that is pleasing or effective.

• 🖊️  In the quiet of the morning, the birds sang in perfect harmony.
• 🖊️  The orchestra played with such harmony that the audience was moved to tears.
• 🖊️  If nations could find harmony, wars would be a relic of the past.
• 🤝  compatibility, accordance, coherence
• ⚔️  incompatibility, disagreement