- to try out or exhibit the use of (a product, process, or the like): You can demo the game without downloading or buying it.
- to record (a song) to demonstrate the merits of the song or performer.
Origin of demo
1935–40; by shortening; see -o
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for demoing
short for demonstration (tape, disc, etc.). Music recording given out for promotional purposes, 1963. The word was used earlier to mean "a public political demonstration" (1936).
Online Etymology Dictionary, © 2010 Douglas Harper