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Assuming you're not being facetious, I would think securities means something that goes up in value that doesn't have an inherently physical nature.

NB. Correct me if I'm mistaken, I have little knowledge in this area.

Check out the Howey Test. It's what you have to fail to be determined not a security, this definition is fairly short and good: http://www.legalandcompliance.com/securities-resources/secur...