atomic
US /əˈtɑː.mɪk/
UK /əˈtɑː.mɪk/
1.
of or relating to an atom or atoms
:
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The scientist studied the atomic structure of the element.
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Atomic energy is a powerful source of electricity.
2.
extremely small; minute
:
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Even an atomic change in the system can have huge consequences.
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He paid atomic attention to every detail.