Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “O, o”

O, o

exclamation     /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. → Compare oh exclamationInterjectionsSounds used as interjections
(Definition of O, o exclamation from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of O, o

Word of the Day

handout

a document given to students or reporters which contains information about a particular subject

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More