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What Are Some Ex Words? exact. exalt. exams. excel. execs. exert. exile. exine. What is prefix ex mean? a prefix meaning “out of,” “from,” and hence “utterly,” “thoroughly,” and sometimes meaning “not” or “without” or indicating a former title, status, etc.; freely used as an English formative: exstipulate; exterritorial; ex-president (former president); ex-member; ex-wife. What