Source : Webster's Revised Unabridged Dictionary (1913)

Expire \Ex*pire"\, v. t. [imp. & p. p. {Expired}; p. pr & vb. n.
   {Expiring}.] [L. expirare, exspirare, expiratum, exspiratum;
   ex out + spirare to breathe: cf. F. expirer. See {Spirit}.]
   1. To breathe out; to emit from the lungs; to throw out from
      the mouth or nostrils in the process of respiration; --
      opposed to inspire.

            Anatomy exhibits the lungs in a continual motion of
            inspiring and expiring air.           --Harvey.

            This chafed the boar; his nostrils flames expire.
                                                  --Dryden.

   2. To give forth insensibly or gently, as a fluid or vapor;
      to emit in minute particles; to exhale; as, the earth
      expires a damp vapor; plants expire odors.

            The expiring of cold out of the inward parts of the
            earth in winter.                      --Bacon.

   3. To emit; to give out. [Obs.] --Dryden.

   4. To bring to a close; to terminate. [Obs.]

            Expire the term Of a despised life.   --Shak.

Source : WordNet®

expired
     adj : having come to an end or become void after passage of a
           period of time; "an expired passport"; "caught driving
           with an expired license" [ant: {unexpired}]