expiry
noun [ U ]
UK uk/ɪkˈspaɪəri/ us( US expiration)the end of an agreement or a document after a fixed length of time:
the expiry of sth The restrictions must apply for not more than two years beyond the expiry of any relevant employment contract.
patent/contract/lease expiry
FINANCE, STOCK MARKET
the end of the period of time during which an option (= the right to buy or sell particular shares) can be exercised (= used):
Friday sees the expiry of the March options series.
a futures/options expiry