Definition of walk-in adjective from the Oxford Advanced Learner's Dictionary

     

    walk-in

     adjective
    adjective
    BrE
     
    ; NAmE
     
    [only before noun]
     
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  1. 1large enough to walk into a walk-in closet
  2. 2not arranged in advance; where you do not need to arrange a time in advance a walk-in interview a walk-in clinic
See the Oxford Advanced American Dictionary entry: walk-in