defunct

[dih-fuhngkt]
adjective
1.
no longer in effect or use; not operating or functioning: a defunct law; a defunct organization.
2.
no longer in existence; dead; extinct: a defunct person; a defunct tribe of Indians.
noun
3.
the defunct, the dead person referred to: the survivors of the defunct.

Origin:
1540–50; < Latin dēfunctus discharged, dead (past participle of dēfungī), equivalent to dē- de- + functus performed; see function

defunctness, noun
nondefunct, adjective
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World English Dictionary
defunct (dɪˈfʌŋkt)
 
adj
1.  no longer living; dead or extinct
2.  no longer operative or valid
 
[C16: from Latin dēfungī to discharge (one's obligations), die; see de-, function]
 
de'functive
 
adj
 
de'functness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

defunct
1540s, from L. defunctus "dead," lit. "off-duty," from pp. of defungi "to discharge, finish," from de- "off, completely," + fungi "perform or discharge duty."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Whether the cricket is dead or alive, traditional wisdom is evidently defunct,
  a tedious chirp no one has time for.
Next we go 2341 feet underground in a defunct Minnesota iron mine to search for
  particles that could reveal dark matter.
As caretakers of a defunct hunting lodge, the couple settled into their winter
  idyll.
Of course, most of these satellites are soon to be (or already) defunct and
  funding for replacements has not been forthcoming.
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