isochrone
/ˈaɪsəˌkroʊn/
noun
- A line on a map or diagram connecting points where something happens at the same time or takes the same amount of time to reach.
- The isochrone for a 30-minute walk from the park covered most of the neighborhood.
- Emergency planners use isochrones to determine how far ambulances can reach in ten minutes.
- The map showed isochrones for travel times from the city center by car.