/ek'speuh ray"sheuhn/ , n.
1. a coming to an end; termination; close: the expiration of a contract.
2. the act of expiring, or breathing out; emission of air from the lungs.
3. Archaic. death.
[ 1375-1425; late ME expiracioun expiration- (s. of expiratio ), equiv. to expirat ( us ) (ptp. of ex ( s ) pirare to EXPIRE) + -ion- -ION ]