Definition of and/or conjunction from the Oxford Advanced American Dictionary

 

and/or

 conjunction
conjunction
NAmE//ˌænd ˈɔr//
 
(informal)
 
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used when you say that two situations exist together, or as an alternative to each other There is no help for those with lots of luggage and/or small children.
See the Oxford Advanced Learner's Dictionary entry: and/or