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  • Definition
    • gas : Matter in an intermediate state between liquid and plasma that can be contained only if it is fully surrounded by a solid (or in a bubble of liquid, or held together by gravitational pull); it can condense into a liquid, or can (rarely) become a solid directly by deposition.

      • gas : A chemical element or compound in such a state.

        • gas : A hob on a gas cooker.

          • gas : or other waste gases trapped in one's belly as a result of the digestive process; flatus.

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          • Derivative