o

noun

ˈō How to pronounce o (audio)
Definition of onext
as in zero
the numerical symbol 0 or the absence of number or quantity represented by it our zip code is six-o-three-seven-five

Synonyms & Similar Words

Relevance

Example Sentences

Recent Examples of Synonyms for o
  1. zero
  2. nothing
  3. nil
  4. aught
Noun
  • Riemann himself proved that nontrivial zeros of the zeta function can only be found in a vertical strip between zero and 1.
    — Quanta Magazine, Quanta Magazine, 19 Oct. 2026
  • Engineers could represent the two configurations as binary digits, or zeros and ones.
    — Aamir Khollam, Interesting Engineering, 13 Oct. 2026
Definition of zero
Noun
  • Women continue marching down the runway in their stilettos and frothy little nothings.
    — Danielle Pergament, Allure, 19 Oct. 2026
  • While CinemaCon 2026 brought us exciting news about new films, it was also bogged down with status quo nothings about how Amazon MGM still hasn’t found a new James Bond.
    — Jason P. Frank, Vulture, 17 Apr. 2026
Definition of nothing
Noun
  • And in the current geopolitical climate, the prospects are next to nil.
    — Ian Johnstone, The Conversation, 9 Sep. 2026
  • Another stunner was Brentford’s 3-nil win over Tottenham Hotspur.
    — Greg Cote August 23, Miami Herald, 23 Aug. 2026
Definition of nil
Noun
  • On their full-length debut, the buzzy NYC siblings pay tribute to the fuckboy charm of the aughts with their precocious, mischievous, and rapidly evolving pop music.
    — Samuel Hyland, Pitchfork, 28 Oct. 2026
  • The iMac targets general consumers and home-office users, dating way back to the iMac G3 that came in several colors in the early aughts.
    — Joe Osborne, PC Magazine, 26 Oct. 2026
Definition of aught
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Browse Nearby Words

nymphs
o
o's
See all Nearby Words

Cite this Entry

“O.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/o. Accessed 31 Oct. 2026.

Copy Citation
Love words? Need even more definitions?

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

More from Merriam-Webster

Word of the Day

Listen to the pronunciation of wraith

See Definitions and Examples »

Popular in Grammar & Usage

See More

How to Use 'Who' vs. 'Whom'

Merriam-Webster’s Great Big List of Words You Love to Hate

'Affect' vs. 'Effect'

'A' or 'an'? What about before 'h'? An Indefinite Article Guide

Why is '-ed' sometimes pronounced at the end of a word?
See More

Popular in Wordplay

See More

The Longest Long Words List

9 Words That Sound Like Insults But Aren't

Pwn, Skibidi, Girlboss and Other Words Added to the 2026 Scrabble Dictionary

The Words of the Week - Oct. 30

12 Lovely and Unusual Words for the Natural World
See More

Popular

See More

How to Use 'Who' vs. 'Whom'

The Longest Long Words List

9 Words That Sound Like Insults But Aren't
See More

Games & Quizzes

See All
Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.
Quordle Can you solve 4 words at once?
Play Blossom: Solve today's spelling word game by finding as many words as you can using just 7 letters. Longer words score more points.
Blossom Pick the best words!
Play Missing Letter: a crossword with a twist. Each of the 25 puzzle words start with a different letter of the alphabet. Which letter is missing?
The Missing Letter A daily crossword with a twist
different halloween monsters in silhouette
A Monstrous Vocab Quiz Words That Go Bump in the Night
See All