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economic risk
economic surplus
economic union
economic welfare
economic zone
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ecotone
ec·o·tone [ ékə tn, kə tn ] (plural ec·o·tones)


noun 
Definition:
 
zone between ecosystems: a zone of transition between two different ecosystems, e.g. where the sea meets the land
[Early 20th century. <eco- + Greek tonos "tension"]
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