ex opere operato (Late L.), by virtue of a work done. See Opus in Dict.
ex parte (L.), on one side, as a partisan.
ex pede Herculem (L.), [we recognise] Hercules from his foot.
experientia docet stultos (L.), experience teaches fools.
experimentum crucis (L.), the experiment of the cross, a crucial test.
experto crede (L.), trust one who has tried, or had experience.
expertus metuit (L.), having had experience, he fears.
ex post facto (L.), retrospective.
expressis verbis (L.), in express terms.
ex professo (L.), avowedly.