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.

1690–1700; back formation from isochronous or isochronal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
isochrone (ˈaɪsəʊˌkrəʊn)
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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