O exists in both uppercase (o) and lowercase (o) forms and plays an important role in word formation, grammar, and phonetics in english. The fifteenth letter of the english alphabet, called o and written in the latin script. The 15th letter of the english alphabet 2.
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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 fifteenth letter of the english alphabet, a vowel. Any spoken sound represented by this letter.
O's os, o's os oes.
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. Definition of o noun in oxford advanced learner's dictionary. The 15th letter of the english alphabet, a vowel. 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 (oʊ) n., pl. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. The semitic form may have derived from an earlier sign. See examples of o used in a sentence.

The long o sound is pronounced.
Used in speech to mean zero: Alternative form of ο, the fifteenth letter of the classical and modern greek alphabets, called omicron.