different between megastate vs metastate

English

mega- +? state

megastate (plural megastates)

A very large geopolitical state.
- 2008, Gary R. Mormino, Land of Sunshine, State of Dreams: A Social History of Modern Florida
  At the dawn of the millennium, it is the fourth largest in the country, a megastate that was among those introducing new words into the American vernacular […]

meta- +? state

metastate (plural metastates)

(physics) A metastable isomer
(statistical mechanics) A probability measure on the space of all thermodynamic states of a system

metastate m (plural metastati)

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