How do you spell Attenuation 

Available Definitions:
1)  n. - The act or process of making slender, or the state of being slender; emaciation.
2)  n. - The act of attenuating; the act of making thin or less dense, or of rarefying, as fluids or gases.
3)  n. - The process of weakening in intensity; diminution of virulence; as, the attenuation of virus.

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