attenuate attenuate /əˈtɛnjuːˌeɪt/

adjective

1. Reduced in strength  ( attenuate , attenuated , weakened , faded )
   reduced in strength
    The faded tones of an old recording
   the faded tones of an old recording
   

verb

1. Become weaker, in strength, value, or magnitude  ( attenuate )
   become weaker, in strength, value, or magnitude
   
2. (chemistry) weaken the consistency of (a chemical substance)  ( attenuate , rarefy )
   (chemistry) weaken the consistency of (a chemical substance)