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

extra-

prefix
 
/ekstrə/,
 
/ɪkˈstræ/
 
/ekstrə/,
 
/ɪkˈstræ/
in adjectives
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  1. outside; beyond
    • extramarital sex
    • extraterrestrial beings
  2. (informal) very; more than usual
    • extra-thin
    • extra-special
  3. Word Originvia medieval Latin from Latin extra ‘outside’.
See extra- in the Oxford Advanced American Dictionary
previously
adverb
 
 
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