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From The Collaborative International Dictionary of English v.0.48:
Potency \Po"ten*cy\, 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]