prefix (also e- before some consonants, ef- before f) 1 forming verbs meaning: a out, forth (exclude; exit). b upward (extol). c thoroughly (excruciate). d bring into a state (exasperate). e remove or free from (expatriate; exonerate). 2 forming nouns from titles of office, status, etc., meaning 'formerly' (ex-convict; ex-president; ex-wife).
[ L f. ex out of ]