Or definition

ôr; ər when unstressed
Operations research.
abbreviation
77
21
Oregon.
abbreviation
64
20
One that performs a specified action.

Accelerator.

suffix
52
19
A person or thing that (does a specified thing)

Mortgagor, incisor.

affix
32
14
Operating room.
abbreviation
21
6
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Before.
preposition
15
7
State; quality; activity.

Valor.

suffix
11
4
Used to indicate a synonymous or equivalent expression.

Acrophobia, or fear of great heights.

conjunction
14
8
(archaic) Used to indicate the first of two alternatives, with the force of either or whether.
conjunction
5
0
Quality or condition.

Favor, error.

affix
8
6
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(now chiefly dial.) Before; ere.
conjunction
4
2
(law) Oregon, as used in case citations.
abbreviation
3
1
(heraldry) The representation of the metal gold: indicated in engravings by small black dots on a white field.
noun
5
4
Used to indicate an alternative, usually only before the last term of a series.

Hot or cold; this, that, or the other.

conjunction
2
1
(no longer productive) A prefix of Old English origin meaning: "from the outset", "original", "out", "out of", or "without".
prefix
1
0
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(military) The lowest NATO military rank code, equivalent to British army private.
abbreviation
1
0
(military) NATO military rank code, equivalent to British army lance corporal or lance bombardier.
abbreviation
1
0
Or is defined as another option or something that means the same thing.

An example of or is saying we can go to one of two places, home or store.

An example of or is saying that cat means the same thing as feline, cat or feline.

conjunction
0
0
Used to indicate the second of two alternatives, the first being preceded by either or whether:

Your answer is either ingenious or wrong. I didn't know whether to laugh or cry.

conjunction
0
0
Before. Followed by ever or ere:
conjunction
0
0
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(military) NATO military rank code, equivalent to British army corporal or bombardier.
abbreviation
0
0
(military) NATO military rank code, intermediate between a British army corporal or sergeant.
abbreviation
0
0
(military) NATO military rank code, equivalent to a British army sergeant.
abbreviation
0
0
(military) NATO military rank code, equivalent to a British army staff sergeant.
abbreviation
0
0
(military) NATO military rank code, equivalent to a British army WO 2 or warrant officer class 2
abbreviation
0
0
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(military) NATO military rank code, equivalent to a British army WO 1 or warrant officer class 1
abbreviation
0
0
Operating room.
abbreviation
3
4
Operations research.
abbreviation
1
2
Oregon.
abbreviation
1
2
(military) A low NATO military rank code, equivalent to British army private.
abbreviation
0
1
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A coordinating conjunction introducing an alternative.
  • Introducing the second of two possibilities.
    Beer or wine.
  • Introducing any of the possibilities in a series, but usually used only before the last.
    Apples or pears or plums; apples, pears, or plums.
  • Introducing a synonymous word or phrase.
    Botany, or the science of plants.
  • Introducing the second of two possibilities when the first is introduced by either or whether.
    Either go or stay; decide whether to go or stay.
  • (old poet.) Substituted for either or whether as the first correlative.
    or in the heart or in the head”.
conjunction
2
4
A logical operator that returns a true value if one or both operands are true.
noun
1
3
Gold, represented in heraldic engraving by a white field sprinkled with small dots.
noun
0
3
Operating room.
abbreviation
0
3
Oregon.
abbreviation
0
3
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Used to indicate uncertainty or indefiniteness.

Two or three.

conjunction
0
4

Origin of or

  • Middle English from other or (from Old English) (from oththe) and from outher (from Old English āhwæther, āther either)

    From American Heritage Dictionary of the English Language, 5th Edition

  • Middle English variant of er from Old English ǣr soon, early and from Old Norse ār ayer- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • Middle English -or, -our from Old French -eor, -eur Anglo-Norman -our, -ur all from Latin -or -ōr-

    From American Heritage Dictionary of the English Language, 5th Edition

  • Middle English -our from Old French -eur from Latin -or -ōr-

    From American Heritage Dictionary of the English Language, 5th Edition

  • Middle English from Old French from Latin aurum

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Middle English or-, from Old English or- (“or-”), from Proto-Germanic *uz- (“out”), from Proto-Indo-European *uds- (“up, out”). Cognate with West Frisian oar-, Dutch oor-, German ur-, Gothic [script?] (us-). Identical with Old English ā- (“a-”). More at a-.

    From Wiktionary