1
a
: of, relating to, or concerned with atoms
atomic physics
b
: nuclear sense 2
atomic energy
2
a
: marked by acceptance of the theory of atomism
3
: minute
4
of a chemical element
: existing in the state of separate atoms
Synonyms
Examples of atomic in a Sentence
made atomic adjustments to the clock's mechanism to keep it from whirring as it ran
Recent Examples on the Web
Radiation levels have not increased, Zelenskyy and the U.N. atomic agency said.
—
Aamer Madhani, Chicago Tribune, 14 Feb. 2025
Trump has previously taken a strong stand on Iran and particularly on a nuclear program which could lead to the development of atomic weapons.
—Thomas G. Moukawsher, Newsweek, 5 Feb. 2025
The clock was established in 1947 by Albert Einstein, Manhattan Project director J. Robert Oppenheimer, and University of Chicago scientists who helped develop the first atomic weapons as part of the Manhattan Project.
—Bill Hutchinson, ABC News, 28 Jan. 2025
An atomic wedgie is classified as one in which a person's underwear is pulled above the victim's head or higher.
—Jackson Thompson, Fox News, 31 Jan. 2025
See all Example Sentences for atomic 
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Aamer Madhani, Chicago Tribune, 14 Feb. 2025
Trump has previously taken a strong stand on Iran and particularly on a nuclear program which could lead to the development of atomic weapons.
—Thomas G. Moukawsher, Newsweek, 5 Feb. 2025
The clock was established in 1947 by Albert Einstein, Manhattan Project director J. Robert Oppenheimer, and University of Chicago scientists who helped develop the first atomic weapons as part of the Manhattan Project.
—Bill Hutchinson, ABC News, 28 Jan. 2025
An atomic wedgie is classified as one in which a person's underwear is pulled above the victim's head or higher.
—Jackson Thompson, Fox News, 31 Jan. 2025
See all Example Sentences for atomic
Dictionary Entries Near atomic
Cite this Entry
“Atomic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/atomic. Accessed 25 Feb. 2025.
Copy CitationKids Definition
atomic
adjective
atom·ic
ə-ˈtäm-ik 
1
: of, relating to, or concerned with atoms, atomic bombs, or nuclear energy
atomic physics
the atomic age
atomic energy
2
: extremely small
3
: found in the state of separate atoms
atomic hydrogen
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