1. Lines on a map connecting points that can be reached from a given location in the same amount of time.
Usage: plural of isochrone; commonly used in geography, urban planning, and transportation analysis
2. In geology and paleontology, lines or surfaces representing events or features of the same age.
Usage: technical usage in earth sciences

Examples

• The city planner used isochrones to show which neighborhoods were within a 30-minute commute.
• Isochrones radiating from the downtown station revealed accessibility patterns across the region.
• The map displayed isochrones at 10-minute intervals to help residents understand travel times.
• Urban designers rely on isochrones to identify underserved areas lacking public transportation.
• The transportation study included isochrones based on both driving and public transit options.