Options on futures generally expire on a specific date during the month preceding the futures contract delivery month. For example, an option on a March futures contract expires in February but is referred to as a March option because its exercise would result in a March futures contract position. Chicago Board of Trade glossary
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The final date when an option may be exercised. Many options expire on a specified date during the month prior to the delivery month for the underlying futures contract. The CENTER ONLINE Futures Glossary
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The final date on which an option may be used.
See American option and European option. American Banker Glossary
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The last day ( in the case of American-style ) or the only day ( in the case of European-style) on which an option may be exercised. For stock options , this date is the Saturday immediately following the third Friday of the expiration month; brokerage firms may set an earlier deadline for notification of an option holder's intention to exercise. If Friday is a holiday, the last trading day will be the preceding Thursday. Bloomberg Financial Dictionary
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The date on which the option will expire. Also, the last day of trading for a futures contract. Chicago Mercantile Exchange Glossary
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( i) Options - the last date after which the option can no longer be exercised.
(ii) Bonds - the date on which a bond matures. Exchange Handbook Glossary
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expiration date UK US noun [C] US
► EXPIRY DATE(Cf. ↑expiry date): »
His license is past its expiration date.
»Discard foods after their expiration date.
Financial and business terms. 2012.