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.

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.

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.

4 days ago · 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, 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.

Definitions of O noun the 15th letter of the Roman alphabet synonyms: o see more

Nov 29, 2025 · ô (lower case, upper case Ô) the letter o with circumflex, used to indicate historical deletion of an adjacent s . For example: hôtel, formerly hostel.