A natural phenomenon of the earth's atmosphere where imbalances in the
static eletric potential between parts of the atmosphere and/or the
ground are removed or reduced through an eletrical discharge.
 
Detailed description at:
 http://thunder.msfc.nasa.gov/primer/index.html

In the field of software a system which enables C code to dynamically
create machine code at runtime. Under the GPL.

This package can be found at:
 http://www.gnu.org/software/lightning/lightning.html