Ex-1  prefix (also before some consonants e-, 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-president; ex-wife). [latin from ex out of]