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Definition of un- prefix from the Oxford Advanced American Dictionary

     

    un-

     prefix
    prefix
    NAmE//ʌn//
     
     
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  1. 1(in adjectives, adverbs, and nouns) not; the opposite of unable unconsciously untruth an un-American concept such as subsidized medical treatment (= not typical of the U.S.)
  2. 2(in verbs that describe the opposite of a process) unlock undo
See un- in the Oxford Advanced Learner's Dictionary
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