noun, plural dem·os.
verb (used with object), dem·oed, dem·o·ing.
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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
noun plural -os informal
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
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