polyrhythm [pol-ee-rith-uhm], noun.
adjective, polyrhythmic [pol-ee-rith-mik]
The simultaneous combination of contrasting rhythms in a musical composition. Rhythmic conflicts, or cross-rhythms, may occur within a single metre (e.g., two eighth notes against triplet eighths) or may be reinforced by simultaneous combinations of conflicting metres. The latter effect is characteristic of numerous non-Western musical forms (e.g. Indonesian gamelan) and of certain Western, especially American, compositions. - Encyclopedia Britannica
Polyrhythms in Cultural Theory:
"Roots and Wires: Polyrhythmic Cyberspace and the Black Electronic," an essay by cultural critic (and Arthur contributor) Erik Davis