Webster's English Dictionary

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lightning

1. light.ning \'li-t-nin\ n [ME, fr. gerund of lightenen to lighten] 1: the 
   flashing of light produced by a discharge of atmospheric electricity  from 
   one cloud to another or from a cloud to the earth; also : the discharge 
   itself 2: a sudden stroke of fortune 
2. lightning aj : moving with or having the speed and suddenness of 
   lightning 
3. lightning vi or light.ninged;  or lightning : to discharge a flash of 
   lightning