/ˈpɪəriəd ||; ˈpɪrɪəd/noun[C] 1 a length of time （一段）时间，时期: The scheme will be introduced for a six-month trial period. 这个方案将有六个月的试验期。Her son is going through a difficult period at the moment. 她的儿子目前正经历一段艰苦的时期。What period of history are you most interested in? 你对哪个时期的历史最感兴趣？
2 a lesson in school （学校里的）一节课，一堂课: We have five periods of English a week. 我们每星期有五节英语课。
3 the time every month when a woman loses blood from her body （妇女的）月经
4 (especially US 尤为美) =FULL STOP