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Definition of attenuation:

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


enfeeblement, devitalization, impoverishment, strong, depletion, enervation, debilitation, fading.

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