Word.ws English Dictionary

big O

big O noun: upper bound function; see big O notation.

Noun

big O (plural big Os)

  1. Upper bound function; see big O notation.
  2. (slang, usually preceded by "the") Orgasm.
    • Various sections of the brain are activated during the Big O, including the limbic system.2024 August 26, Kimberly Delarosa, “Can Orgasms Make You Smarter? Here’s What Experts Say”, in Glamour, archived from the original on 18 Mar 2025
    • Think of the faked O in Harry Met Sally, what she did in that restaurant.2025 October 21, John Matthew Fox, “9 Writing Strategies of Authors in the Top 1%”https://youtu.be/_EeaAfAOxTw?t=284s, Bookfox
  3. (slang) Opium.
    Synonyms:
    aunti/aunti Emma, chandu, Chinese tobacco, dopium, dream gun, dream stick, fi-do-nie, gee, God's medicine, gondola

Synonyms of big O

16 more synonymsFewer synonyms

Forms of big O

pluralbig Os

Questions about big O

What does big O mean?
Big O means upper bound function; see big O notation.
What part of speech is big O?
Big O is a noun.
What is the plural of big O?
The plural of big O is big Os.

Words near big O in the dictionary

  1. Big Nambas
  2. big name
  3. big names
  4. big noise
  5. big noises
  6. big O
  7. big O notation
  8. big oil
  9. big ol'
  10. big old
  11. big ole

Source and license

Adapted from Wiktionary: big O (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: En-au-big O.ogg.

Cite this entry: “big O.” Word.ws, https://word.ws/big_o. Based on Wiktionary, CC BY-SA 4.0.