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

sub-

prefix
 
/sʌb/
 
/sʌb/
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  1. (in nouns and adjectives) below; less than
    • sub-zero temperatures
    • a subtropical (= almost tropical) climate
    • substandard
  2. (in nouns and adjectives) under
    • subway
    • submarine
  3. (in verbs and nouns) a smaller part of something
    • subdivide
    • subset
  4. Word Originfrom Latin sub ‘under, close to’.
See sub- in the Oxford Advanced American DictionarySee sub- in the Oxford Learner's Dictionary of Academic English
previously
adverb
 
 
From the Word list
Oxford 3000
B1
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