GNU Collaborative International Dictionary of English

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1.       
   Puissance, n. [F., fr. puissant. See Puissant, and cf. Potency, Potance, Potence.] Power; strength; might; force; potency. “ Youths of puissance.”
   Tennyson.
   
   1913 Webster
   The power and puissance of the king.
   Shak.
   
   1913 Webster
   ☞ In Spenser, Shakespeare, and Milton, puissance and puissant are usually dissyllables.
   1913 Webster