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lightening (n.)
[lightening 词源字典]
"the shedding of light," mid-14c., verbal noun from
lighten
(v.2). Meaning "alleviation of weight" (literal and figurative) is from 1520s, from
lighten
(v.1).
[lightening etymology, lightening origin, 英语词源]
[lightening 词源字典]