Definition of out- prefix from the Oxford Advanced American Dictionary

     

    out-

     prefix
    prefix
    NAmE//aʊt//
     
     
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  1. 1(in verbs) greater, better, further, longer, etc. outnumber outwit outgrow outlive
  2. 2(in nouns and adjectives) outside; outward; away from outbuildings outpatient outlying outgoing
See the Oxford Advanced Learner's Dictionary entry: out-