WordWeb Online

1. Reduced in strength
   "the attenuate tones of an old recording";
   - attenuated, faded, weakened

1. Become weaker, in strength, value, or magnitude
    
2. (chemistry) weaken the consistency of (a chemical substance)
   - rarefy, rarify [rare]

Derived forms: attenuating, attenuates, attenuated

See also: decreased, reduced

Type of: weaken

Encyclopedia: Attenuate