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expert system
expert witness
expertise (1)
expertise (2)
expertize
expiate
expiration date
expiratory
expire
expiry
expiry date
explain
explain away
explanation
explanatory
explant
expletive
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expire

ex·pire [ ik spr ] (past and past participle ex·pired, present participle ex·pir·ing, 3rd person present singular ex·pires)


intransitive verb 
Definition:
 
1. end or be no longer valid: to come to an end or be no longer valid or in operation
My visa has expired.

2. die: to die or release a last breath ( formal or literary )

3.  ( technical )
Same as  exhale (sense 1)


[14th century. Via French< Latin exspirare "breathe out" < spirare "breathe"]

ex·pi·ra·tion [ èkspə ráysh'n ] noun
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