atomic

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a·tom·ic / əˈtämik/ • adj. of or relating to an atom or atoms: the atomic nucleus. ∎ Chem. (of a substance) consisting of uncombined atoms rather than molecules: atomic hydrogen. ∎  of or forming a single irreducible unit or component in a larger system: a society made up of atomic individuals pursuing private interests. ∎  relating to, denoting, or using the energy released in nuclear fission or fusion: the atomic age required a new way of political thinking atomic weapons.DERIVATIVES: a·tom·i·cal·ly / -ik(ə)lē/ adv.