Also known as complex or additive meters, non-isochronous meters are featured mostly in non-western music, and are based on cycles of prime numbers (e.g 7 & 11), or uneven divisions of non prime numbers (e.g. 9 divided 2+2+2+3).
For more information, “Non-Isochronous Meters,” in Hearing in TimePsychological Aspects of Musical Meter Oxford Scholarship Online. University Press Scholarship, 2013. Web. 21 Feb. 2013.