Definition of add-in noun from the Oxford Advanced Learner's Dictionary

     

    add-in

     noun
    noun
    BrE
     
    ; NAmE
     
    (computing) Computer software
     
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  1. 1a computer program that can be added to a larger program to allow it do more things See related entries: Computer software
  2. 2= expansion card
See the Oxford Advanced American Dictionary entry: add-in