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Definition of atomic clock noun from the Oxford Advanced Learner's Dictionary

atomic clock

noun
 
/əˌtɒmɪk ˈklɒk/
 
/əˌtɑːmɪk ˈklɑːk/
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  1. an extremely accurate clock that uses the movement of atoms or molecules to measure time
See atomic clock in the Oxford Advanced American Dictionary
Check pronunciation: atomic clock

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