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or

conjunction (EXPLAIN)
 
 
strong /ɔːr/ US  /ɔːr/ weak /ər/ US  /ɚ/

Definition

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.Relative forms
(Definition of or conjunction (EXPLAIN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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