o'·​clock | \ ə-ˈkläk How to pronounce o'clock (audio) , ō- \

Definition of o'clock

1 : according to the clock the time is three o'clock
2 used for indicating position or direction as if on a clock dial that is oriented vertically or horizontally an airplane approaching at six o'clock

Examples of o'clock in a Sentence

Recent Examples on the Web Twelve o'clock high: WWII-era B-17 coming to Indy for flights, tours next month The Indianapolis-to-Phoenix flight is one of 28 new routes Allegiant announced this week nationwide. Fox59, Indianapolis Star, "Allegiant adds Indianapolis to Phoenix flight," 20 June 2017

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

First Known Use of o'clock

1535, in the meaning defined at sense 1

History and Etymology for o'clock

contraction of of the clock

Keep scrolling for more

Learn More about o'clock

Time Traveler for o'clock

Time Traveler

The first known use of o'clock was in 1535

See more words from the same year

Statistics for o'clock

Cite this Entry

“O'clock.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/o%27clock. Accessed 10 Apr. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for o'clock



English Language Learners Definition of o'clock

: according to the clock


o'·​clock | \ ə-ˈkläk How to pronounce o'clock (audio) \

Kids Definition of o'clock

: according to the clock The time is one o'clock.

More from Merriam-Webster on o'clock

Nglish: Translation of o'clock for Spanish Speakers

Comments on o'clock

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


Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
Spell It

Can you spell these 10 commonly misspelled words?

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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