Webster's English Dictionary

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expiration

ex.pi.ra.tion \.ek-sp*-'ra--sh*n\ n 1a: the act or process of releasing air 
   from the lungs through the nose or  mouth archaic  1b: the last emission of 
   breath : DEATH  2: the fact of coming to an end : TERMINATION  3: something 
   produced by breathing out