Meaning of ATTENUATION in English
noun the act or process of making slender, or the state of being slender; emaciation.
2. attenuation ·noun the process of weakening in intensity; diminution of virulence; as, the attenuation of virus.
3. attenuation ·noun the act of attenuating; the act of making thin or less dense, or of rarefying, as fluids or gases.
Webster English vocab. Английский словарь Webster. 2012