isochrone

[ahy-suh-krohn]
noun
a line, as on a map, connecting all points having some property simultaneously, as in having the same delay in receiving a radio signal from a given source or requiring the same time to be reached by available transportation from a given center.

Origin:
1690–1700; back formation from isochronous or isochronal

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World English Dictionary
isochrone (ˈaɪsəʊˌkrəʊn)
 
n
a line on a map or diagram connecting places from which it takes the same time to travel to a certain point

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The water in the area bounded by the isochrone is captured by a well within a specified time period.
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