Sentence:  Traditionally, the verb defenestrate means to throw out of a window. But as Australian companies take their first timid steps towards installing non-proprietary software on corporate desktops, <WSD>defenestration</WSD> is starting to be linked to the throwing out of Windows software. 
Meaning of the word marked with <WSD> tags:  The act of removing the (Microsoft Windows) operating system from a computer in order to install an alternative one.