Isochrone definitions

īsōkrōn, īsəkrōn
A line, as on a chart or map, connecting points that have the same value at the same time.
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An isoline on a map or chart connecting points that have the same value of a quantity that has dimension time.

Isochrones of urban development.

(hydrology) (transportation planning) Isochrones of equal travel time.

noun
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(mathematics) A semicubical parabola.
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