Meaning of isochrone

i•so•chrone

Pronunciation: (ī'su-krōn"), [key]
— n.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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