Definition of in- prefix from the Oxford Advanced American Dictionary

     

    in-

     prefix
    prefix
    NAmE//ɪn//
     
     
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  1. 1(also il-, im-, ir-) (in adjectives, adverbs, and nouns) not; the opposite of infinite illogical immorally irrelevance
  2. 2(also im-) (in verbs) to put into the condition mentioned inflame imperil
See the Oxford Advanced Learner's Dictionary entry: in-