"attenuated" in the verb sense
1. rarefy, attenuate
weaken the consistency of (a chemical substance)
2. attenuate
become weaker, in strength, value, or magnitude
"attenuated" in the adjective sense
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"
Source: WordNet® (An amazing lexical database of English)
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