- 1[uncountable] (symbol C) a chemical element. Carbon is found in all living things, existing in a pure state in two main forms (diamond and graphite) carbon fiber
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- 2[uncountable] used when referring to the gas carbon dioxide in terms of the effect it has on the earth's climate in causing global warming carbon emissions/levels/taxes How do we move to a low-carbon economy?
- 3[countable] = carbon copy
- 4[countable] a piece of carbon paper
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