Etymology
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expiration (n.)

early 15c., expiracioun, "vapor, breath," from Latin expirationem/exspirationem (nominative expiratio/exspiratio) "a breathing out, exhalation," noun of action from past-participle stem of expirare/exspirare "breathe out; breathe one's last" (see expire). Meaning "termination, end, close" is from 1560s.

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Definitions of expiration

expiration (n.)
a coming to an end of a contract period;
Synonyms: termination / expiry
expiration (n.)
euphemistic expressions for death;
Synonyms: passing / loss / departure / exit / going / release
expiration (n.)
the act of expelling air from the lungs;
Synonyms: exhalation / breathing out
From wordnet.princeton.edu