Etymology
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attenuate (v.)

"to make thin, to make less," 1520s, from Latin attenuatus, past participle of attenuare "to make thin, lessen, diminish," from assimilated form of ad "to" (see ad-) + tenuare "make thin," from tenuis "thin," from PIE root *ten- "to stretch." Related: Attenuated; attenuating. Earlier was Middle English attenuen "to make thin (in consistency)," early 15c.

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Definitions of attenuate
1
attenuate (v.)
weaken the consistency of (a chemical substance);
Synonyms: rarefy
attenuate (v.)
become weaker, in strength, value, or magnitude;
2
attenuate (adj.)
reduced in strength;
Synonyms: attenuated / faded / weakened
From wordnet.princeton.edu