or conjunction - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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English definition of “or”

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or

conjunction uk   strong /ɔːr/  us   /ɔːr/ weak /ər/  /ɚ/

or conjunction (POSSIBILITIES)

A1 used to connect different possibilities: Is it Tuesday or Wednesday today? You can pay now or when you come back to pick up the paint. Are you listening to me or not? The patent was granted in (either) 1962 or 1963 - I can't quite remember which. It doesn't matter whether you win or lose - it's taking part that's important. There were ten or twelve (= approximately that number of) people in the room. He was only joking - or was he (= but it is possible that he was not)?A2 used after a negative verb to mean not one thing and also not another: The child never smiles or laughs.
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or conjunction (IF NOT)

B1 if not: You should eat more, or you'll make yourself ill.
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or conjunction (EXPLAIN)

B2 used to show that a word or phrase means the same as, or explains, limits, or corrects, another word or phrase: Rosalind, or Roz to her friends, took the initiative. Things have been going quite well recently. Or they were, up until two days ago.
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(Definition of or conjunction from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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