• (British) IPA: /ɔː(ɹ)/
    • (America) IPA: /ɔɹ/
    • (STL) IPA: /ɑɹ/
    • (America) IPA: /ɚ/
  1. Connects at least two alternative words, phrases, clauses, sentences, etc. each of which could make a passage true. In English, this is the "inclusive or." The "exclusive or" is formed by "either […] or".
    In Ohio, anyone under the age of 18 who wants a tattoo or body piercing needs the consent of a parent or guardian.
    He might get cancer, or be hit by a bus, or God knows what.
  2. (logic) An operator denoting the disjunction of two propositions or truth values. There are two forms, the inclusive or and the exclusive or.
  3. Counts the elements before and after as two possibilities.
  4. Otherwise a consequence of the condition that the previous is false.
    It's raining! Come inside or you'll catch a cold!
  5. Connects two equivalent names.
    The country Myanmar, or Burma
Synonyms Translations
  • French: ou
  • German: oder
  • Italian: o, od (euphonic alt. form used before a vowel), oppure
  • Portuguese: ou
  • Russian: и́ли
  • Spanish: o, (before words beginning in 'o-' or 'ho-') u

or (plural ors)

  1. (logic, electronics) Alternative form of OR


  1. (tincture) The gold or yellow tincture on a coat of arms.
    • 1909, Arthur Charles Fox-Davies, A Complete Guide to Heraldry
      The metals are gold and silver, these being termed "or" and "argent".
  • (gold or yellow tincture) o., Or
Related terms
  • Au (chemical symbol for gold)
  • French: or
  • German: Gold
  • Italian: oro
  • Portuguese: ouro
  • Russian: зо́лото
  • Spanish: oro

or (not comparable)

  1. (tincture) Of gold or yellow tincture on a coat of arms.
Synonyms Translations Adverb


  1. (obsolete) Early (on).
  2. (obsolete) Earlier, previously.
  1. (now, archaic or dialect) Before; ere.
    • 1834, Samuel Taylor Coleridge, "The Rime of the Ancient Mariner"
      I looked to heaven, and tried to pray;
      But or ever a prayer had gusht,
      A wicked whisper came, and made
      My heart as dry as dust.

  1. (logic) Inclusive or; either one proposition or the other is true or both.
  2. (computer science) A lexical symbol to implement inclusive or in a computer language.
  3. (electrical engineering) A logical gate to implement inclusive or.

or (uncountable)

  1. (logic) The binary operator inclusive or, true if one at least one of two inputs is true. In infix notation.
    OR Truth Table
    Input !! rowspan="2" | Output
    A !! B
    0 0 0 || 0 || 0
    0 1 0 || 1 || 1
    1 0 1 || 0 || 1
    1 1 1 || 1 || 1


  2. (healthcare, countable) Initialism of operating room
    • 1998, Rushmore, 00:27:55
      Max Fischer: I like your nurse's uniform, guy. -- Dr. Peter Flynn: These are O.R. scrubs. -- Max Fischer: Oh, are they?
  3. (sciences, uncountable) Initialism of operations research
  4. (sports, countable) Initialism of Olympic Record
  5. (anatomy, countable) Initialism of odorant receptor
  6. (anatomy, countable) Initialism of w:olfactory receptor
  7. (Wiktionary and WMF jargon) Initialism of original research
Antonyms Proper noun
  1. Oregon, a state of the United States of America.
  2. Orissa, a state of India.

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