Definition of “o'” - English Dictionary

(Definition of “o'” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“O” in American English

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Onoun

us //

O noun (LETTER)

[ C ] plural O’s, Os, o’s or os also o the 15th letter of the English alphabet

O noun (ZERO)

[ U ] (spelled the way it is often spoken) zero

Oexclamation

us // old use

O exclamation (EMOTION)

used when addressing someone or something, or when expressing strong emotion:

"O! Canada" is the Canadian national anthem.

(Definition of “O” from the Cambridge Academic Content Dictionary © Cambridge University Press)