Etymology
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defunct (adj.)

"dead, deceased, extinct," 1590s, from Old French defunct (14c., Modern French defunt) or directly from Latin defunctus "dead," literally "off-duty," past-participle adjective from defungi "to discharge, finish," from de- "off, completely" (see de-) + fungi "perform or discharge duty" (see function (n.)).

updated on July 12, 2018

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Definitions of defunct from WordNet

defunct (adj.)
no longer in force or use; inactive;
a defunct organization
a defunct law
defunct (adj.)
having ceased to exist or live;
the will of a defunct aunt
a defunct Indian tribe
From wordnet.princeton.edu, not affiliated with etymonline.