o' Meaning in the Cambridge English Dictionary
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Meaning of “o'” in the English Dictionary

"o'" in British English

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o'preposition

uk   us   /ə/
used in writing to ​represent "of" when the ​letter f is not ​pronounced: a ​bottle o' ​beer

O'preposition

uk   /əʊ/  us   //
used as ​part of many last ​names: Jeanne O'Connor
(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 ​Englishalphabet

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 ​expressingstrongemotion: "O! Canada" is the ​Canadiannationalanthem.
(Definition of O from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of o'?