Answer me this.

[Occhidiangela]

You really believe a semantics issue makes an interseting argument?

Personally I find it to be the bane of good converation.
Anyway here is the primary definition from Dictonary Onlnine.

   1. Vibrations transmitted through an elastic solid or a liquid or gas, with frequencies in the approximate range of 20 to 20,000 hertz, capable of being detected by human organs of hearing.
   2. Transmitted vibrations of any frequency.
   3. The sensation stimulated in the organs of hearing by such vibrations in the air or other medium.
   4. Such sensations considered as a group.

Sound could be defined either way, but in the context of the question its obviously the first definition, the question being asked, of itself clearly precludes the 3rd meaning.
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The definition is a bit lacking in technical accuracy. Liquid and fluid are not physically equivalent terms: liquid is, as related to sound, a subset of "fluid." The definition fails to spell out that sound, as most often experienced, is propagated in a fluid. (Air is a fluid. So is water.) Granted "liquid" and "fluid" are similar terms for the great unwashed, but I am being picky with a dictionary since it is a dictionary. Precision in definition aids discussion more than it hinders it, IMO. Your spelling out the propoerties of sound was thus a good idea. :)

Occhi