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• or
  or

  conjunction

  (used to connect words, phrases, or clauses representing alternatives).
• OR
  OR

  noun

  a Boolean operator that returns a positive result when either or both operands are positive.
• -or
  -or

  a suffix occurring in loanwords from Latin, directly or through Anglo-French, usually denoting a condition or property of things or persons (ardor; honor; horror; liquor; pallor; squalor; torpor; tremor ), sometimes corresponding to qualitative adjectives ending in -id4 (horrid; pallid; squalid; torpid ). A few other words that originally ended in different suffixes have been assimilated to this group (behavior; demeanor; glamour ).
• O.R.
  O.R.

  abbreviation

  owner's risk.

or

¹ American  

[awr, er] / ɔr, ər /

conjunction

1. (used to connect words, phrases, or clauses representing alternatives).

   books or magazines; to be or not to be.

2. (used to connect alternative terms for the same thing).

   the Hawaiian, or Sandwich, Islands.

3. (used in correlation).

   either … or; or … or; whether … or.

4. (used to correct or rephrase what was previously said).

   His autobiography, or rather memoirs, will soon be ready for publication.

5. otherwise; or else.

   Be here on time, or we'll leave without you.

6. Logic. the connective used in disjunction.

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or ² American  

[awr] / ɔr /

preposition

Chiefly Irish, Scot., and English.

1. before; ere.

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or ³ American  

[awr] / ɔr /

noun

1. the tincture, or metal, gold: represented either by gold or by yellow.

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adjective

1. of the tincture, or metal, gold.

   a lion or.

OR ⁴ American  

[awr] / ɔr /

noun

1. a Boolean operator that returns a positive result when either or both operands are positive.

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OR ⁵ American  

abbreviation

1. Law. on (one's own) recognizance.

2. operating room.

3. operations research.

4. Oregon (approved especially for use with zip code).

5. owner's risk.

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-or ⁶ American  

1. a suffix occurring in loanwords from Latin, directly or through Anglo-French, usually denoting a condition or property of things or persons (ardor; honor; horror; liquor; pallor; squalor; torpor; tremor ), sometimes corresponding to qualitative adjectives ending in -id4 (horrid; pallid; squalid; torpid ). A few other words that originally ended in different suffixes have been assimilated to this group (behavior; demeanor; glamour ).

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-or ⁷ American  

1. a suffix forming animate or inanimate agent nouns, occurring originally in loanwords from Anglo-French (debtor; lessor; tailor; traitor ); it now functions in English as an orthographic variant of -er, usually joined to bases of Latin origin, in imitation of borrowed Latin words containing the suffix -tor (and its alternant-sor ). The association with Latinate vocabulary may impart a learned look to the resultant formations, which often denote machines or other less tangible entities which behave in an agentlike way: descriptor; plexor; projector; repressor; sensor; tractor .

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O.R. ⁸ American  

abbreviation

1. owner's risk.

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or ¹ British  

/ ə, ɔː /

conjunction

1. used to join alternatives

   apples or pears

   apples or pears or cheese

   apples, pears, or cheese

2. used to join rephrasings of the same thing

   to serve in the army, or rather to fight in the army

   twelve, or a dozen

3. used to join two alternatives when the first is preceded by either or whether

   whether it rains or not we'll be there

   either yes or no

4. a few

5. See else

6. a poetic word for either or whether as the first element in correlatives, with or also preceding the second alternative

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OR ² British  

abbreviation

1. operations research

2. Oregon

3. military other ranks

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-or ³ British  

suffix

1. indicating state, condition, or activity

   terror

   error

2. the US spelling of -our

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or ⁴ British  

/ ɔː /

conjunction

1. (subordinating; foll by ever or ere) before; when

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preposition

1. before

-or ⁵ British  

suffix

1. a person or thing that does what is expressed by the verb

   actor

   conductor

   generator

   sailor

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or ⁶ British  

/ ɔː /

adjective

1. (usually postpositive) heraldry of the metal gold

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Spelling

While the -or spelling of the suffix -or1 is characteristic of American English, there are occasional exceptions, as in advertising copy, where spellings such as colour and favour seek to suggest the allure and exclusiveness of a product. The spelling glamour is somewhat more common than glamor —not actually an instance of -or1, but conformed to it orthographically in the course of the word's history. In British English -our is still the spelling in most widespread use, -or being commonly retained when certain suffixes are added, as in color ation, honor ary, honor ific, labor ious, odor iferous. The English of the Southern Hemisphere (Australia, New Zealand, South Africa) tends to mirror British practice, whereas Canadian English shares with the U.S. a preference for -or but with -our spellings as freely used variants. The suffix -or2 is now spelled -or in all forms of English, with the exception of the word savior, often spelled saviour in the U.S. as well as in Britain, especially with reference to Jesus.

Usage

See and/or, either.

Etymology

Origin of or¹

First recorded in 1150–1200; Middle English, originally the second, unstressed member of correlative other … or, earlier other … other, Old English āther … oththe, ā-hwæther … oththe, for oththe … oththe either … or; cf. ay ¹, whether

Origin of or²

First recorded before 950; Middle English er, ar, or, Old English ār “before, soon, early”; cognate with Old Norse ār “early, anciently, of yore,” Gothic air “soon, early”; compare Old English ǣr “before, soon”; see ere

Origin of or³

First recorded in 1400–50; Middle English, from Old French, from Latin aurum “gold”

Origin of OR⁴

1940–45

Origin of -or⁶

From Latin; in some cases continuing Middle English -our, from Anglo-French, Old French, from Latin -ōr-, stem of -or, earlier -os

Origin of -or⁷

Middle English < Anglo-French, Old French -o ( u ) r < Latin -ōr-, stem of -or, extracted from -tōr -tor by construing the t as the ending of the past participle (hence Latin factor maker, equivalent to fac ( ere ) to make + -tor, was analyzed as fact ( us ), past participle of facere + -or ); merged with Anglo-French, Old French -ëo ( u ) r < Latin -ātōr- -ator; cf. -eur

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Example Sentences

See Examples For:

or OR -or O.R.

"No personal data related to our rentals is shared with car manufacturers, our owners or other third parties without explicit legal grounds," he added, without specifying whether the onboard videos may have been transferred.

From Barron's ● Oct. 17, 2026

"How we solve problems depends on if we play against a man-marking team or a complete zonal team," said Matos.

From BBC ● Oct. 17, 2026

"We don't know for sure where the information is sent or what it's used for," NSM official Andreas Skjold-Lorange told AFP.

From Barron's ● Oct. 17, 2026

The only way for Wardley to win is to throw the kitchen sink at Dubois for the first three or four rounds.

From BBC ● Oct. 17, 2026

Stowed under the seat or ready to hand, the tamping iron goes everywhere Phineas goes.

From "Phineas Gage" by John Fleischman

This happened in Minneapolis on opening night, this happened in Los Angeles, in Portland, OR, in Atlanta, in New York City, in Chicago.

From Salon ● May 28, 2026

The transaction provides OR with additional precious metals production from a lower-risk jurisdiction, and bolsters the company’s five-year guidance, Raymond James’ Brian MacArthur says.

From The Wall Street Journal ● Apr. 15, 2026

When the snow settled, Chris Scott Thomason, of Bend, OR, had disappeared.

From Los Angeles Times ● Jan. 6, 2026

Johannesburg's international airport, once known as Jan Smuts – honouring a former prime minister – is now called OR Tambo, after the anti-apartheid leader and former president of the ANC.

From BBC ● Oct. 11, 2025

PRE-MED OR PRE-WED? asks a caption on Carver's social media page.

From "You Bring the Distant Near" by Mitali Perkins

Approximately 0.5% of Etsy's active sellers -or around 2,700 merchants- had their payments delayed on Friday related to SVB's collapse, according to Etsy.

From Reuters ● Mar. 13, 2023

Maurina says he knows journalists need to go back to the basics to survive -or revive - in small-town America.

From Washington Times ● Mar. 10, 2019

Greater conflict seems inevitable but which side will triumph -or even if there will be anything like a decisive victory and a new settlement - isn't clear.

From BBC ● Nov. 20, 2015

Does the perfect goal exist outside of a match's context, or does the effect it has on the match -or season, or tournament - act as some sort of multiplication factor?

From BBC ● May 23, 2015

Haymitch is our only hope, but nothing is forthcoming, either from lack of money -everything will cost an exorbitant amount -or because he's dissatisfied with our performance.

From "The Hunger Games" by Suzanne Collins

A juror in the trial of A.I. author O.R.

From Slate ● Jun. 24, 2023

International check-in counters stand empty after several airlines stopped flying out of South Africa because of the spread of the new Omicron coronavirus variant, at O.R.

From Reuters ● Dec. 6, 2021

“Those O.R. nurses, many have never worked as a floor nurse,” she said.

From New York Times ● Apr. 3, 2020

“No one is going to the O.R. and interfere in that process,” Wolf said.

From Los Angeles Times ● Oct. 13, 2019

"Rich in soil, salubrious in climate, varied in productions, the home of commerce," says the Hon. O.R.

From History of Cuba; or, Notes of a Traveller in the Tropics Being a Political, Historical, and Statistical Account of the Island, from its First Discovery to the Present Time by Maturin Murray Ballou

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