1. a line or curve connecting points that can be reached in equal time from a given starting point
Usage: commonly used in geography, urban planning, and transportation studies
2. in geology and paleontology, a line or surface representing rocks or strata of the same age
Usage: technical; used in stratigraphy and geochronology

Examples

• The city planner drew isochrones around the transit station to show which neighborhoods could be reached within 15 minutes.
• Isochrones help urban designers understand accessibility and plan public transportation networks more effectively.
• The map displayed isochrones of 10, 20, and 30 minutes from the downtown area.
• Geologists use isochrones to correlate rock layers across different regions and establish their relative ages.
• An isochrone map revealed that rural areas were significantly less accessible by car than suburban zones.