an ending of the period of time when an official document can be used, or when an agreement or contract is valid （文件、协议、合同）到期，期满◆The licence can be renewed on expiry. 许可证到期时可以延期。
() the end of the period of time when an option can be used or a futures contract is valid （期权或期货合约）到期◆The oil futures contract reached $80 a barrel before its expiry at the end of the day. 石油期货合约在到期前当日收盘达到了每桶 80 美元。