Definition of or conjunction from the Oxford Advanced Learner's Dictionary

      

    or

     conjunction
    conjunction
    BrE BrE//ɔː(r)//
     
    ; NAmE NAmE//ɔːr//
     
     
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  1. 1  used to introduce another possibility Is your sister older or younger than you? Are you coming or not? Is it a boy or a girl? It can be black, white or grey. compare either… or…
  2. 2  used in negative sentences when mentioning two or more things He can't read or write. There are people without homes, jobs or family. compare neither… nor…
  3. 3  (also or else) used to warn or advise somebody that something bad could happen; otherwise Turn the heat down or it'll burn.
  4. 4  used between two numbers to show approximately how many There were six or seven of us there.
  5. 5  used to introduce a word or phrase that explains or means the same as another geology, or the science of the earth’s crust It weighs a kilo, or just over two pounds.
  6. 6  used to say why something must be true He must like her, or he wouldn't keep calling her.
  7. 7  used to introduce a contrasting idea He was lying—or was he?
  8. Word Origin Middle English: a reduced form of the obsolete conjunction other (which superseded Old English oththe ‘or’), of uncertain ultimate origin.Idioms  about It'll cost €100 or so.
    or somebody/something/somewhere, somebody/something/somewhere or other
     
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     (informal) used when you are not exactly sure about a person, thing or place He's a factory supervisor or something. ‘Who said so?’ ‘Oh, somebody or other. I can't remember who it was.’
See the Oxford Advanced American Dictionary entry: or