• (a.) Isochronal.
(i″so-kron´ik) isochronous.
I`so·chron'ic adjective Isochronal. 
isochronic, isochronism 1. Not varying in time; occurring at the same time or at a regular time. 2. Having the characteristics of a uniform rate of operation or periodicity; for example, as a pendulum or watch balance.