Pronunciation IPA (key): /ˈsɪm.fə.ni/ or [ˈsɪɱ.fə.ni] Audio (UK)(file) Noun Singular symphony Plural symphonies (countable) (music) A symphony is music that is written for an orchestra. Beethoven's most famous symphony was Symphony No. 5.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads