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.

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.

Learn all about the Letter O, with Jackson! Can you make the O sound? How many words do you know starting with the Letter O? Time to learn the alphabet!

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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.

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

Accents placed on the letter O —such as Ó, Ò, Ô, Õ, and Ö —change pronunciation, meaning, or grammatical emphasis. Accented O has a unique sound, and its usage varies depending on the …

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.