symphony
/ˈsɪmfəni/·심포니·noun
a long musical work for full orchestra
GreekCEFR B2
Root
sym- (together) + Greek 'phōnē' (sound)
Greek symphōnia (concord of sound) → Latin symphonia → Old French symphonie → English symphony
In a word
sym- (together) + phone (sound) = 'many sounds coming together in one flow'. The word covers orchestral works and also "a symphony of colour". The root names belonging-together, not music alone. "Symposium" is in the same sym family — sitting together, drinking and talking.
Examples
Beethoven's ninth symphony is famous.
The orchestra played a Mozart symphony.
It was a symphony of colours and lights.
Related
telephonephoneticmegaphonemicrophonesymphonic