Meaning of LIGHTNING in English
n. & adj.
n. a flash of bright light produced by an electric discharge between clouds or between clouds and the ground.
attrib.adj. very quick (with lightning speed). lightning-conductor (or -rod) a metal rod or wire fixed to an exposed part of a building or to a mast to divert lightning into the earth or sea. lightning strike a strike by workers at short notice, esp. without official union backing.
[ ME, differentiated from lightening, verbal noun f. LIGHTEN(2) ]
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012