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Definition of: isopleth
(ī′sə·pleth) noun
1. Meteorol. A graph showing the variations of a specified climatic element with respect to two coordinates, temporal and spatial, the latter generally being an altitude factor.
2. An isogram.
3. A nomograph. [<Gk. isoplēthēs equal in number or quantity <iso- equal + plēthos number, quantity]
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