Wiktionary
isochron
n. (context geology English) A line on a chart linking rock of the same age (especially as measured using the ratios of lead isotopes)
Wikipedia
Isochron
In the mathematical theory of dynamical systems, an isochron is a set of initial conditions for the system that all lead to the same long-term behaviour.
Usage examples of "isochron".
Hunt found him staring at a display of isochrons and distorted spacetime geodesics, and looking very thoughtful.
Hunt found him staring at a display of isochrons and distorted spacetime geodesics, and looking very thoughtful.