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.

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 …

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.

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.

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.

5-Letter Words Starting with O: oaken, oasis, obese, occur, ocean, octal, octet, odder, oddly, offal, offer, often