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

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 …

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

The name of the Latin scriptletter O/o. A zero(used in reading out numbers). It is currently two-o-five in the afternoon (2:05 PM). The first permanent English settlement in America was in …

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.

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 …

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.

From Longman Dictionary of Contemporary English Related topics: Letters & punctuation, Numbers O1, o /əʊ $ oʊ/ noun (plural O’s, o’s) 1 [countable, uncountable] the 15th letter of the …

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.