mensural
/mɛnˈsjʊərəl/Definitions
1. adjective
relating to or measured by a system of time signatures or rhythmic patterns
“The composer’s use of mensural notation added a unique layer of complexity to the piece.”
2. noun
a system of notation used in music to represent rhythmic patterns and time signatures
“The choir’s conductor explained the mensural notation system to help the singers understand the complex rhythms.”