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



    BrE BrE//ˈekstrə//
    ; NAmE NAmE//ˈekstrə//
    (in adjectives)
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  1. 1outside; beyond extramarital sex extraterrestrial beings
  2. 2(informal) very; more than usual extra-thin extra-special More Like This Prefixes a-, ante-, anti-, be-, co-, de-, demi-, dis-, en-, ex-, extra-, hyper-, hypo-, il-, in-, infra-, inter-, intra-, mis-, non-, off-, oft-, out-, over-, para-, post-, pre-, pro-, re-, retro-, semi-, sub-, trans-, ultra-, un-, under-, up-See worksheet.
  3. Word Originvia medieval Latin from Latin extra ‘outside’.
See the Oxford Advanced American Dictionary entry: extra-