Category:Attenuation

At*ten`u*a"tion, n. Etym: [L. attenuatio: cf. F. atténuation.]

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.