The Defenestration reference article from the English Wikipedia on 24-Apr-2004
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Defenestration

Defenestration is the act of throwing someone or something out of a window (the word comes from Latin language roots). Historically, it was used as an act of political dissent, notably the Defenestrations of Prague.

Some meanings from FOLDOC (Free Online Dictionary of Computing) are:

More recently, the term defenestration has been used for the act of removing Microsoft Windows from a PC.