Potency may refer to:

• Potency (pharmacology), a measure of the activity of a drug in a biological system
• Virility
• In biology, potency is a measure of the differentiation potential of stem cells
• In seismology, the quotient of seismic moment and rigidity
• In homeopathy, potency is a measure of how dilute a substance is. In potencies over 12C (24X) no molecules of the original substance may remain.

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