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. O is the fifteenth (number 15) letter in the English alphabet and it has a shape of a circle. It appears after “N” and before “P”. The letters O and o take this name if they are not treated as alphabetic letters used to represent phonemes /ɔ/. For example, in geometry, point O is called điểm ô , not *điểm o. 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 (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. Easy Learning Spanish Grammar. Use this music video to teach and learn the Alphabet, Phonics, the Short Vowel O Sound, the Long Vowel O Sound, Vocabulary Words with the Short O Sound and Long O Sound, and How to Write. 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. O definition: the fifteenth letter of the English alphabet, a vowel. See examples of O used in a sentence. The O with accent is a commonly used character in many languages, including Spanish, Portuguese, French, German, and Italian. Accents placed on the letter O —such as Ó, Ò, Ô, Õ, Ö —change pronunciation, meaning, or grammatical emphasis.