- Date: 15th century
- 1 : reduced especially in thickness, density, or force
- 2 : tapering gradually usually to a long slender point <attenuate leaves>
In physics, attenuation (in some contexts also called extinction) is the gradual loss in intensity of any kind of flow through a medium. For instance, sunlight is attenuated by dark glasses, X-rays are attenuated by lead, and light and sound are attenuated while passing through seawater.