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  1. O - Wikipedia

    O , or o , is the fifteenth letter and the fourth vowel letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide.

  2. O | History, Etymology, & Pronunciation | Britannica

    O, the fourth vowel of the modern alphabet, corresponding to the Semitic ayin, which represented a breathing and not a vowel. The Semitic form may have derived from an earlier sign …

  3. O definition and meaning | Collins English Dictionary

    O is used to mean zero, for example when you are telling someone a phone number, or mentioning a year such as 1908.

  4. o - Wiktionary, the free dictionary

    Noun [edit] o(pluraloes) The name of the Latin-scriptletter O/o. A zero(used in reading out numbers). It is currently two-o-five in the afternoon (2:05 PM). The first permanent English …

  5. O, o | definition in the Cambridge English Dictionary

    O, o meaning: 1. the 15th letter of the English alphabet 2. used in speech to mean zero: 3. used when talking to…. Learn more.

  6. O noun - Definition, pictures, pronunciation and usage notes ...

    Definition of O noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  7. O - WordReference.com Dictionary of English

    O, o /oʊ/ n. [countable], pl. O's or Os; o's or os or oes. the 15th letter of the English alphabet, a vowel. O /oʊ/ interj., n., pl. O's. interj. (used before a person's name when speaking to that …

  8. O' Definition & Meaning - Merriam-Webster

    The meaning of O' is on. How to use o' in a sentence.

  9. O Definition & Meaning | Dictionary.com

    O definition: the fifteenth letter of the English alphabet, a vowel.. See examples of O used in a sentence.

  10. O - definition of O by The Free Dictionary

    O, o (oʊ) n., pl. O's Os, o's os oes. 1. the 15th letter of the English alphabet, a vowel. 2. any spoken sound represented by this letter.