atomic clock

noun
|Updated on: 12 Jun 2018

Definition of atomic clock

: a precision clock that depends for its operation on an electrical oscillator regulated by the natural vibration frequencies of an atomic system (such as a beam of cesium atoms)

Recent Examples of atomic clock from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'atomic clock.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of atomic clock

1924

in the meaning defined above

See Words from the same year
NEW! Time Traveler

ATOMIC CLOCK Defined for English Language Learners

atomic clock

Definition of atomic clock for English Language Learners

  • : a special kind of clock that is extremely exact


Learn More about atomic clock


Seen and Heard

What made you want to look up atomic clock? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

a figure representing a hated person

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a-closeup-of-a-sunflower
  • Which of the following words means “of or relating to summer”?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!