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Definition of un- prefix from the Oxford Advanced Learner's Dictionary

un-

prefix
 
/ʌn/
 
/ʌn/
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  1. (in adjectives, adverbs and nouns) not; the opposite of
    • unable
    • unconsciously
    • untruth
  2. (in verbs that describe the opposite of a process)
    • unlock
    • undo
See un- in the Oxford Advanced American Dictionary
previously
adverb
 
 
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