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English definition of “extra-”

extra-

prefix     /ek.strə-/
outside or in addition to: extraterrestrial beings (= imaginary creatures which come from outside the planet Earth ) an extramarital affair (= a sexual relationship of a married person with someone other than their husband or wife ) extracurricular activities (= activities which are not part of the usual school or college course )Also, extra, and in addition
(Definition of extra- prefix from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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