iso·rhythm \ˈ ̷ ̷ ̷ ̷+ˌ-\noun Etymology:is- + rhythm : a single fixed rhythmic pattern typically long and complex that is reiterated throughout the whole of a sung voice part which is usually the tenor < isorhythm in late medieval motets > • iso·rhythmic\| ̷ ̷ ̷ ̷+\adjective