expiry /ikˈspī(ə)rē/ noun 1. (Brit.) (Canadian) the end of the period for which something is valid • the expiry of the patent • [as modifier] an expiry date. 2. (Brit.) (Canadian) the end of a fixed period of time • the expiry of the six-month period. 3. (Brit.) (Canadian) ‹archaic› death.