Definition of 'gas'

Noun

1. 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
      Synonyms: gaseous state
2. a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
3. a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines
      Synonyms: gasoline gasolene petrol
4. a state of excessive gas in the alimentary canal
      Synonyms: flatulence flatulency
5. a pedal that controls the throttle valve; "he stepped on the gas"
      Synonyms: accelerator accelerator pedal gas pedal throttle gun
6. a fossil fuel in the gaseous state; used for cooking and heating homes
      Synonyms: natural gas

Verb

1. attack with gas; subject to gas fumes; "The despot gassed the rebellious tribes"
2. show off
      Synonyms: boast tout swash shoot a line brag blow bluster vaunt gasconade

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