(uncountable) The chemical element (symbol Ne) with an atomic number of 10. The second of the noble gases, it is a colourless, odorless inert gas.

(countable) A form or sample of the element.

(countable, uncountable) Neon signs or lights, collectively.

(countable) A neon tetra fish.

(of a color) That resembles a neon light; extremely bright; fluorescent