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demo (n.)

"music recording given out for promotional purposes," by 1958 in "Billboard" headlines and advertisements, short for demonstration disk. The word was used earlier to mean "a public political demonstration" (1936).

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Definitions of demo from WordNet
1
demo (v.)
give an exhibition of to an interested audience;
We will demo the new software in Washington
Synonyms: show / exhibit / present / demonstrate
2
demo (n.)
a visual presentation showing how something works;
Synonyms: demonstration
From wordnet.princeton.edu