1. (

• rarefy ,
• attenuate ,

) weaken the consistency of (a chemical substance) ;

2. (

• attenuate

) become weaker, in strength, value, or magnitude ;

1. (

• attenuated ,

) of an electrical signal; reduced in amplitude with little or no distortion ;

2. (

• attenuate ,
• attenuated ,
• faded ,
• weakened

) reduced in strength; "the faded tones of an old recording" ;