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

under-

prefix
 
/ʌndə(r)/
 
/ʌndər/
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  1. (in nouns and adjectives) below
    • undergrowth
    • undercoat
  2. (in nouns) lower in age or rank
    • the under-fives
    • an undergraduate
  3. (in adjectives and verbs) not enough
    • underripe
    • undercooked
See under- in the Oxford Advanced American Dictionary
sufficiently
adverb
 
 
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