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.

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.

Understanding the Context

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

O, o definition: 1. the 15th letter of the English alphabet 2. used in speech to mean zero: 3. used when talking to. Learn more.

Definition of O noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Key Insights

The fifteenth letter of the English alphabet: from the Greek omega and omicron, both borrowed from the Phoenician. Any of the speech sounds that this letter represents, as, in English, the vowel () of boat,.

O, o (o) 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.

The fifteenth letter of the English alphabet is 'O'. It is also the fourth vowel in the English language. Vowels are sounds that are pronounced without any restriction in the vocal tract. It means we can produce it.