What is "isochrone"

n. 1 An isoline on a map or chart connecting points that have the same value of a quantity that has dimension time. 2 (context mathematics English) A semicubical parabola

n. an isogram connecting points at which something occurs or arrives at the same time

Isochrone may refer to:

• Stellar isochrone, the curve on the Hertzsprung–Russell diagram representing stars of the same age
• Isochrone curve, the curve (a cycloid) for which objects starting at different points finish at the same time and point when released
• Isochrone map, shows areas related to isochrones between different points