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potency (n.)

mid-15c., from Latin potentia "power," from potentem "potent," from potis "powerful, able, capable," from PIE root *poti- "powerful; lord." 

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Definitions of potency from WordNet

potency (n.)
the power or right to give orders or make decisions;
a place of potency in the state
potency (n.)
capacity to produce strong physiological or chemical effects;
the toxin's potency
Synonyms: effectiveness / strength
potency (n.)
the inherent capacity for coming into being;
Synonyms: potential / potentiality
potency (n.)
the state of being potent; a male's capacity to have sexual intercourse;
Synonyms: potence
From wordnet.princeton.edu