\ ˈdā How to pronounce day (audio) \

Definition of day

1a : the time of light between one night and the next the shortest day of the year
b : daylight sense 1 woke up at the break of day
c : daytime sleeps during the day and works at night
2 astronomy : the period of rotation of a planet (such as earth) or a moon on its axis the length of one day on Mars
3 : the mean solar day of 24 hours beginning at midnight by mean time open seven days a week the first day of every month Take one pill two times a day.
4 : a specified day or date their wedding day the day of her birth
5 : a specified time or period : age in grandfather's day often used in plural the old daysthe days of sailing ships
6 : the conflict or contention of the day played hard and won the day
7 : the time established by usage or law for work, school, or business starts his day with a cup of coffee after a long day at school We have a busy day tomorrow.
day after day
: for an indefinite or seemingly endless number of days wore the same pants day after day
day in, day out
: for an indefinite number of successive days does the same thing at work day in, day out

Synonyms & Antonyms for day



Visit the Thesaurus for More 

Examples of day in a Sentence

We're open seven days a week, 365 days a year. Payment is due on the first day of every month. “What day of the week is the 28th?” “It's a Friday.” He spent five days in the hospital. She left on Thursday and came back four days later. That was the happiest day of my life. Parenthood gets better every day. The office is closed for the day. She works eight hours a day. It costs 10 dollars a day to park there. See More
Recent Examples on the Web Don't let anyone fool you into thinking that Halloween is just one day, on October 31. Marisa Lascala, Good Housekeeping, 16 June 2022 One one particularly horrible day, the caregiver called again, this time 911. Carolyn Rosenblatt, Forbes, 15 June 2022 Today is gonna be one steamy day in Northeast, Ohio. Laura Johnston, cleveland, 15 June 2022 Washington has one more day of minicamp on its schedule, with Thursday’s practice concluding the Commanders’ full-team offseason program. Mark Inabinett |, al, 15 June 2022 When, also participates in Doggust, a month-long art challenge where artists draw a dog every day. Saleen Martin, USA TODAY, 15 June 2022 An alternate numberplate system has been launched, meaning that cars can only access the famous 22-mile stretch between Vietri sul Mare and Positano every other day, during peak hours in peak season. Julia Buckley, CNN, 15 June 2022 These are kids who are reading all of these headlines every day, who are hearing these hateful things ... Dave Boucher, Detroit Free Press, 14 June 2022 The regulatory decision is part of the FAA's full environmental review of SpaceX's Starship spacecraft and Super Heavy rocket system, which are being developed to one day ferry cargo and human passengers to the moon and beyond. Denise Chow, NBC News, 13 June 2022 See More

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

First Known Use of day

before the 12th century, in the meaning defined at sense 1a

History and Etymology for day

Middle English, from Old English dæg; akin to Old High German tag day

Buying Guide

Our Reviews team has selected the best 2022 planners.

Learn More About day

Time Traveler for day

Time Traveler

The first known use of day was before the 12th century

See more words from the same century

Dictionary Entries Near day




See More Nearby Entries 

Statistics for day

Last Updated

18 Jun 2022

Cite this Entry

“Day.” Dictionary, Merriam-Webster, Accessed 28 Jun. 2022.

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

More Definitions for day


\ ˈdā How to pronounce day (audio) \

Kids Definition of day

1 : the time between sunrise and sunset : daylight
2 : the time a planet or moon takes to make one turn on its axis A day on earth lasts 24 hours.
3 : a period of 24 hours beginning at midnight The offer expires in ten days.
4 : a specified day or date Tuesday is Election Day.
5 : a particular time : age There was no Internet in your grandparent's day.
6 : the time set apart by custom or law for work He works an eight-hour day.

Day biographical name (1)

\ ˈdā How to pronounce Day (audio) \

Definition of Day

 (Entry 1 of 3)

Clarence Shepard, Jr. 1874–1935 American author


biographical name (2)

Definition of Day (Entry 2 of 3)

Thomas 1748–1789 English author


biographical name (3)

Definition of Day (Entry 3 of 3)

William Rufus 1849–1923 American statesman and jurist

More from Merriam-Webster on day

Nglish: Translation of day for Spanish Speakers

Britannica English: Translation of day for Arabic Speakers Encyclopedia article about day


Test Your Vocabulary

Great Words for Scrabble

  • scrabble tiles that read scrabble quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
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!