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.

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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 representing an eye.

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

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

Dec 11, 2025 · Learn the various methods and techniques to type the letter O with an accent mark (ò, ó, ô, õ, ö) using your Windows or Mac keyboard.

The fifteenth letter of the English alphabet, called o and written in the Latin script.

In chemistry, O represents the symbol "oxygen". In medicine, O is one of the human blood types. Sometimes when saying decimals, O is another word for 0.

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