Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “atomic”


adjective     /əˈtɒm.ɪk/ US  /-ˈtɑː.mɪk/
relating to atoms: atomic structure/nuclei → See also nuclearChemistry - general words B2 using the energy that is created when an atom is divided: atomic energy/power atomic scientistsChemistry - general words atomically     /-ɪ.kəl.i/ adverb Chemistry - general words
(Definition of atomic adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of atomic

Definitions of “atomic” in other dictionaries

Word of the Day


a person or group who receives money, advantages, etc. as a result of something else

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More