Isopleth definitions

īsōple, īsəple
The line connecting points on a graph or map that have equal or corresponding values with regard to certain variables.
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A line drawn on a map through all points having the same value of some measurable quantity.
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Thermodynamics A line in a phase diagram indicating the same mole fraction.
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Origin of isopleth

From iso- +‎ Ancient Greek πλῆθος (plēthos, “a great number”).