Definition of polyrhythmically in US English:

polyrhythmically

adverb

Music
  • In a polyrhythmic manner; incorporating polyrhythms.

Origin

1940s. Either from polyrhythmic + -ally, or from polyrhythmical + -ly.

Pronunciation

polyrhythmically

/ˌpɒlɪˈrɪðmɪkli/