n. 变稀薄, 变纤细, 衰减

[计] 衰减

[化] 弱化作用

[医] 稀释; 衰减, 减弱

Attenuation \At*ten`u*a"tion\, n. [L. attenuatio: cf. F.
att['e]nuation.]
1. The act or process of making slender, or the state of
being slender; emaciation.

2. The act of attenuating; the act of making thin or less
dense, or of rarefying, as fluids or gases.

3. The process of weakening in intensity; diminution of
virulence; as, the attenuation of virus.