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. Contact us. Special pages. Search. Appearance. Donations. Create account. Log in. Personal tools. Donations. Create account. Log in. Contents. 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 (minuscule: 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. This super-catchy and clear alphabet song also lets children hear the letter O sound and see each letter at the beginning of five simple words paired with colorful kid-friend images. Ó (minuscule: ó), known as O-acute, is a Latin-script character composed of the letter O and an acute accent. It is found in the Czech, Dobrujan Tatar, Emilian-Romagnol, Faroese, Hungarian, Icelandic, Kashubian, Polish, Slovak, Karakalpak, and Sorbian languages. 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. Its name in English is o, plural oes. 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 language and context. Learn how to easily type O with accent marks for various languages. Enhance your typing skills today! Get the Super Simple App! Learn letter O with an alphabet surprise from Turn and Learn ABCs, from the makers of Super Open site.