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or

 
 
strong /ɔːr/ weak /ər/ conjunction

Definition

BETWEEN POSSIBILITIES used between possibilities, or before the last in a list of possibilities: Would you like toast or cereal? Is that a boy or a girl? You can have beer, wine, or mineral water. The house will take two or three years to complete.
CHANGE used to change or correct something you have said: We told the truth, or most of it.
REASON used to give a reason for something you have said: She must love him or she wouldn't have stayed with him all these years.
NOT EITHER used after a negative verb between a list of things to mean not any of those things or people: Tim doesn't eat meat or fish. She doesn't have a telephone or a fax machine.
(Definition of or conjunction from the Cambridge Learner's Dictionary © Cambridge University Press)

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