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attenuation (n.)
[attenuation 词源字典]
early 15c., of persons, "emaciation;" of diet, "reduction," from Latin
attenuationem
(nominative
attenuatio
) "a lessening," noun of action from past participle stem of
attenuare
(see
attenuate
).
[attenuation etymology, attenuation origin, 英语词源]