noun
A line on a map connecting points at which something occurs or arrives at the same time.
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An isochrone is a curve on a map that connects points that have the same travel time from a specific location.
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The isochrone on the map shows how far you can get in 30 minutes from here.
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Check out the isochrone line on the map, it's like a time-travel path!
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The isochrone of success in this industry is different for everyone.