Attenuation is the gradual loss in intensity of any kind of flux through a medium.

Attenuation may also refer to:

• Attenuation (brewing), the percent of sugar converted to alcohol and carbon dioxide by the yeast in brewing
• Attenuation coefficient, a basic quantity used in calculations of the penetration of materials by quantum particles or other energy beams
• Mass attenuation coefficient, a measurement of how strongly a chemical species or substance absorbs or scatters light at a given wavelength, per unit mass
• Regression dilution, a cause of statistical bias
• The process of producing an attenuated vaccine by reducing the virulence of a pathogen
• Attenuation constant, the real part of the propagation constant
• Attenuator (genetics), form of regulation in prokaryotic cells.

See also

• Attenuator (disambiguation)