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.