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WordReference Random House Unabridged Dictionary of American English © 2024i•so•chrone (ī′sə krōn′),USA pronunciation n. - Geographya 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.
- back formation from isochronous or isochronal 1690–1700
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