Gas

What does GAS mean?

1. noun

   the state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container

2. noun

   a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely

3. noun

   a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines

4. noun

   a state of excessive gas in the alimentary canal

Definitions from WordNet 3.1, Princeton University.