bitonality

[ bahy-toh-nal-i-tee ]
/ ˌbaɪ toʊˈnæl ɪ ti /

noun, plural bi·to·nal·i·ties. Music.

the simultaneous occurrence of two tonalities in a composition.

Origin of bitonality

First recorded in 1925–30; bi-1 + tonality
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019