carbon >> /ˈkɑrbən/
Definition: [noun] The chemical element of atomic number 6, a nonmetal which has two main forms (diamond and graphite) and which also occurs in impure form in charcoal, soot, and coal.Carbon fiber.A rod of carbon in an arc lamp.A piece of carbon paper or a carbon copy.
Example: Combustion, or burning, is a chemical process involving carbon, hydrogen and oxygen.
Definition: [noun] Carbon dioxide or other gaseous carbon compounds released into the atmosphere, associated with climate change.
Example: the level of carbon in the atmosphere has been consistently rising