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.

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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.

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

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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.

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

In chemistry, O represents the symbol "oxygen". In medicine, O is one of the human blood types. Sometimes when saying decimals, O is another word for 0.

4 days ago · Out of the 22,468 students who sat the 2025 Singapore-Cambridge O-level examinations, 19,522 or 86.9 per cent of the cohort attained five or more passes, said the Ministry of Education and ...