GNU Collaborative International Dictionary of English

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1.       
   Inertion (?), n. Lack of activity or exertion; inertness; quietude. [R.]
   
   [1913 Webster]
   
   These vicissitudes of exertion and inertion of the arterial system constitute the paroxysms of remittent fever. E. Darwin.
   
   [1913 Webster]