attenuation
1. [ noun ] weakening in force or intensity
Synonyms: fading
Examples:

: "attenuation in the volume of the sound"

Related terms: weakening fade
2. [ noun ] the property of something that has been weakened or reduced in thickness or density
Related terms: weakness rarefy
Similar spelling:   attention
  attentional
  attenuate
  attenuator
  attenuated
  attention_span
  attendant
  attend_to
  attentive
  attending