O, o Meaning in the Cambridge English Dictionary
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Meaning of “O, o” in the English Dictionary

"O, o" in British English

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O, onoun [C or U]

uk   /əʊ/  us   // (plural Os, O's or o's)

O, o noun [C or U] (LETTER)

the 15th ​letter of the ​Englishalphabet

O, o noun [C or U] (ZERO)

(also o, also oh) used in ​speech to ​mean zero: My ​phonenumber is three, one, o, five, one, ​double o (= 3105100). The ​year 1705 is usually ​pronounced seventeen o five.

O, oexclamation

uk   /əʊ/  us   // old use or literary
used when ​talking to someone or something, or ​expressing something in an ​emotional or ​formal way: O Zeus! Hear my ​prayer.
(Definition of O, o from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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