👉 A polyrhythmically defined term is a musical term that refers to a musical composition where the rhythm of the music, such as the tempo and the beats per minute (BPM), are varied. This can be achieved by using different rhythms or tempos in different sections of the piece. The term "polyrhythmically" means that the rhythm of the music is not uniform but varies throughout the piece, creating a sense of complexity and richness in the music.