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English definition of “or”

or

conjunction (EXPLAIN)    strong /ɔːr/ US  /ɔːr/ weak /ər/ US  /ɚ/
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 Grammar:Or and otherwiseWe often use or and otherwise with conditional meanings:Grammar:OrOr is a conjunction that connects two or more possibilities or alternatives. It connects words, phrases and clauses which are the same grammatical type:
(Definition of or conjunction (EXPLAIN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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