Use the noun potency when you're talking about the strength of something. You could refer to the potency of a drug or the potency of a political leader.

Potency is an official measurement in pharmacology, or the science of prescribing drugs. It's also useful for describing a person's power or authority over others. The Latin root word is potentia, or "power," and its origin goes all the way back to the Sanskrit word for "master or husband," patih. The word potency has historically been associated with men, but it's fine to use it to describe a woman's power too.

Definitions of potency

n the power or right to give orders or make decisions

“a place of potency in the state”
authorisation, authority, authorization, dominance, say-so
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power of appointment
authority given (in a will or deed) by a donor to a donee to appoint the beneficiaries of the donor's property
carte blanche
complete freedom or authority to act
the power or authority to command
supreme authority; absolute dominion
the authority of a lord
authority or power or force (especially when used in a coercive way)
the authority of a state to govern another state
Type of:
power to direct or determine

n capacity to produce strong physiological or chemical effects

“the toxin's potency
effectiveness, strength
Type of:
power, powerfulness
possession of controlling influence

n the state of being potent; a male's capacity to have sexual intercourse

impotence, impotency
an inability (usually of the male animal) to copulate
Type of:
physical condition, physiological condition, physiological state
the condition or state of the body or bodily functions

n the inherent capacity for coming into being

potential, potentiality
the state of being not yet evident or active
chance, prospect
the possibility of future success
Type of:
possibility, possibleness
capability of existing or happening or being true

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