1 [mass noun] the chemical element of atomic number 6, a non-metal which has two main forms (diamond and graphite) and which also occurs in impure form in charcoal, soot, and coal. (Symbol: C)
[usually as modifier] carbon fibre:a bike with a carbon frame
[count noun] a rod of carbon in an arc lamp.
[count noun] a piece of carbon paper or a carbon copy.
2carbon dioxide or other gaseous carbon compounds released into the atmosphere, associated with climate change:the level of carbon in the atmosphere has been consistently rising [as modifier]:fossil fuel consumption and carbon emissions continued to rise
