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  1. Dictionary

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    o'
    [əʊ, ə]
    preposition
    informal
    1. short for of, used to represent a pronunciation.
      "a cup o' coffee"
    -o
    [əʊ]
    suffix
    1. forming chiefly informal or slang variants or derivatives such as beano, wino.
    Origin
    perhaps from oh, reinforced by abbreviated forms such as hippo, photo.
    -o-
    [əʊ]
    suffix
    1. used as the terminal vowel of combining forms:
      "chemico-" · "Gallo-"
    Origin
    from Greek.
    O'
    [əʊ, ə]
    prefix
    1. in Irish patronymic names such as O'Neill.
    Origin
    mid 18th century: from Irish ó, ua ‘descendant’.
    O
    [əʊ]
    noun
    O (noun) · Os (plural noun) · O's (plural noun) · o (noun) · os (plural noun) · oh (noun)
    1. the fifteenth letter of the alphabet.
      • denoting the next after N in a set of items, categories, etc.
      • a human blood type (in the ABO system) lacking both the A and B antigens. In blood transfusion, a person with blood of this group is a potential universal donor.
    2. nought or zero (in a sequence of numerals, especially when spoken):
      "two seven o seven point six"
    3. a shape like that of a capital O; a circle:
      "he made an O with his mouth"
    O
    [əʊ]
    abbreviation
    1. US
      Ohio.
    2. cricket
      (on scorecards) over(s).
    symbol
    1. the chemical element oxygen.
    O
    [əʊ]
    exclamation
    archaic
    1. another spelling of oh.
    2. used before a name in direct address, as in prayers and poetry:
      "give peace in our time, O Lord"
    Origin
    natural exclamation: first recorded in Middle English.
    o
    [əʊ]
    abbreviation
    chemistry
    1. ortho-:
      "o -xylene"
    Translate o' to
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  2. People also ask
    What does O mean in English?
    O is the fifteenth letter of the English alphabet. O is used to mean zero, for example when you are telling someone a phone number, or mentioning a year such as 1908. O is used in exclamations, especially when you are expressing strong feelings . O how mistaken you are! O God, I want to go home. 4. See also oh 5.

    O definition and meaning | Collins English Dictionary

    collinsdictionary.com
    Does O Say can you see a line that starts with an O?
    O say can you see … that this line begins with an “O” and not an “Oh”? “O” may seem like just an old fashioned way to write “Oh,” but it actually has a slightly different meaning. Consider some other famous O’s: O Captain, my captain, O Pioneers, O Come All Ye Faithful, O Canada, O Brother Where Art Thou, O ye of little faith, O Christmas Tree.

    What’s the Difference Between “O” and “Oh”? - Mental Floss

    mentalfloss.com
    What is the difference between OH and O?
    The convention now is that while “oh” can be lower case, and is usually followed by a comma, “O” is always uppercase and without a comma. But there hasn’t always been a strict separation between the two forms. “Oh” and “O” were used interchangeably for a long time.

    What’s the Difference Between “O” and “Oh”? - Mental Floss

    mentalfloss.com
    Is Oh a comma?
    “Oh” has a wider range. It can indicate pain, surprise, disappointment, or really any emotional state. While “oh, man!” could mean a number of things, “O man!” means “hey, you there … you man over there.” The convention now is that while “oh” can be lower case, and is usually followed by a comma, “O” is always uppercase and without a comma.

    What’s the Difference Between “O” and “Oh”? - Mental Floss

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  3. o' [ uh, oh ] show ipa preposition a shortened form of of, as in o'clock or will-o'-the-wisp. Chiefly Dialect. a shortened form of on.

    O' Definition & Usage Examples | Diction…

    www.dictionary.com/browse/o
    In Middle English and later colloquial use, o or o' can be an abbreviation of on or of, and is still literary in some words (o'clock, Jack-o'-lantern, tam-o'-shanter, cat-o'-nine-tails, will-o'-the-wisp, etc.).

    O | Etymology of O by etymonline

    www.etymonline.com/word/O
    Collins Concise English Dictionary © HarperCollins Publishers:: O symbol for oxygen a human blood type of the ABO group O /əʊ/ interj a variant spelling of oh an exclamation introducing an invocation, entreaty, wish, etc: O God!, O for the wings of a dove!

    O - WordReference.com Dictionary of En…

    www.wordreference.com/definition/O
  4. Collins Dictionary
    https://www.collinsdictionary.com/dictionary/english/o

    O definition and meaning | Collins English Dictionary

    • American

      [perh. orig. the interjection O, appended to words as in def. 2; as a derivational …

    • ABO

      2 meanings: Australian offensive, slang → short for Aborigine, Aboriginal → the …

    • Ortho

      6 meanings: 1. straight or upright 2. perpendicular or at right angles 3. …

    • French Translation of “O

      French Translation of “O - O definition and meaning | Collins English Dictionary

    • Octavo

      3 meanings: 1. Also called: eightvo a book size resulting from folding a sheet of …

    • Madonna

      Madonna - O definition and meaning | Collins English Dictionary

    • Oregon

      A state of the northwestern US, on the Pacific: consists of the Coast and …

    • Stanhope

      3 meanings: a light one-seater carriage with two or four wheels 1. Charles, 3rd Earl. …

    See results only from collinsdictionary.com
  5. Cambridge Dictionary
    https://dictionary.cambridge.org/us/dictionary/english/o

    O, o | definition in the Cambridge English Dictionary

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    O/O - What does O/O stand for? The Free Dictionary
    acronyms.thefreediction…
    O definition in American English | Collins English Dictionary
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  6. Merriam Webster
    https://www.merriam-webster.com/dictionary/o'

    O' Definition & Meaning - Merriam-Webster

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    What does Ō stand for?
    abbreviations.com
    O - Wikipedia
    en.wikipedia.org
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  7. Dictionary
    https://www.dictionary.com/browse/o'-

    O' Definition & Meaning | Dictionary.com

    Tags:
    Letter O
    O in English
    O Meaning
  8. Dictionary
    https://www.dictionary.com/browse/o

    O Definition & Meaning | Dictionary.com

    Tags:
    Letter O
    O in English
    O Meaning
  9. Mental Floss
    https://www.mentalfloss.com/article/56582/whats-difference-betwee…

    What’s the Difference Between “O” and “Oh”? | Mental Floss

  10. WordReference
    https://www.wordreference.com/definition/O

    O - WordReference.com Dictionary of English

    Tags:
    O in English
    O Meaning
    Letter O
    O Wiktionary
    Etymology Corrigan
  11. Google Translate
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    Google Translate

  12. Oxford Learner's Dictionaries
    https://www.oxfordlearnersdictionaries.c…

    Oxford Learner's Dictionaries | Find definitions, …

    WEBThe largest and most trusted free online dictionary for learners of British and American English with definitions, pictures, example sentences, synonyms, antonyms, word origins, audio pronunciation, and more.

  13. Longman Dictionary of Contemporary English Online
    https://www.ldoceonline.com/dictionary/o

    O | meaning of O in Longman Dictionary of Contemporary English …

    Tags:
    Letter O
    O in English
    O Meaning