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.

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.

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

o - Wiktionary, the free dictionary. Jump to content. Main menu. move to sidebarhide. Navigation . Main page. Community portal. Requested entries. Recent changes. Random entry. Help. Glossary. …

Learn how to easily type O with accent marks for various languages. Enhance your typing skills today!

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

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.