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# power

1. In optics, the refractive vergence of a lens. 2. In physics and engineering, the rate at which work is done. 3. The exponent of a number or expression that provides the number of times that number has to be multiplied by itself.
- back vertex p. the effective p. of a lens as measured from a surface toward the eye; a standard for measurement of ophthalmic lenses.
- carbon dioxide combining p. a measurement of the total CO2 that can be bound as HCO2 at a PCO2 of 40 mmHg at 25°C by serum, plasma, or whole blood.
- equivalent p. the p. equal to an infinitely thin lens as measured on an optical bench.
- resolving p. 1. definition of a lens; in a microscope objective lens it is calculated by dividing the wavelength of the light used by twice the numerical aperture of the objective. SEE ALSO: definition. 2. analogies to other modalities, e.g., two-point discrimination in neurologic examination. Commonly misinterpreted as random error, although it has none of its properties. 3. SYN: resolution (2).
- statistical p. in Neyman-Pearson hypothesis testing, the probability of rejecting the null hypothesis when it is false; the complement of an error of the second kind.
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Patients Online for Wellness, Education and Research

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pow·er 'pau̇(-ə)r n
1) an inherent property or effect <a drug that enhances the heart's pumping \power (Kathleen Fackelmann)>
2) MAGNIFICATION (2b)

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pow·er (pouґər) [L. posse to have power] 1. capability; potency; the ability to act. 2. a measure of magnification, as of a microscope. 3. the rate at which work is done. Symbol P. The SI unit of power is the watt. 4. of a statistical test: the probability of correctly rejecting the null hypothesis when a specified alternative holds true; it is equal to 1 minus the probability of a Type II error.

Medical dictionary. 2011.

Synonyms:

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