GNU Collaborative International Dictionary of English

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1.       
   Potency , n. [L. potentia, from potens, -entis, potent. See Potent, and cf. Potance, Potence, Puissance.] The quality or state of being potent; physical or moral power; inherent strength; energy; ability to effect a purpose; capability; efficacy; influence. “Drugs of potency.” 
   Hawthorne.
   
   1913 Webster
   A place of potency and away o' the state.
   Shak.
   
   1913 Webster