Emergency

google

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mid 17th century: from medieval Latin emergentia, from Latin emergere ‘arise, bring to light’ (see emerge).

wiktionary

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Borrowed from Medieval Latin emergentia, from Latin emergens, present participle of emergo, equivalent to emergent +‎ -cy or emerge +‎ -ency.

etymonline

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emergency (n.)

"unforeseen occurrence requiring immediate attention," 1630s, from Latin emergens, present participle of emergere "to rise out or up" (see emerge). Or from emerge + -ency. As an adjective by 1881.