Definitions

1. noun

A line on a map that connects points at the same instant in time, used to represent the path of a traveling object or a wave.

“The isochrone map helped the hikers to plan their route and arrive at the campsite at the same time.”

2. noun

A curve or line that represents a constant value or condition, especially in geography, physics, or mathematics.

“The isochrone of the temperature in the city showed the areas with the same temperature at a given time.”