n (1)一段时间 (any length of time) [C]： a～of two days/years 两天/年的时间;during a～of several months 几个月期间;within a five-week～在五周时间内;a～of peace/recovery 一段和平/恢复时期;a long/short～of time 很长/短一段时间;for long/short～s 很长/短的时间;live for a～in Italy 在意大利生活一段时期;The students' lunch～is from twelve to one. 学生午饭时间从12点至1点。He suffered～s of bad health. 他经历了几段健康不佳的时期。〖同〗time，interval，stretch;

(2) 1)时期(代) (particular stretch of time in the life of a person， nation or civilization) [C]： one's early～某人的早年时期;the prehistoric/post-war～史前/战后时期;many important events in this～这一时期许多重要的事件;the～of Queen Victoria/the French Revolution 维多利亚女王/法国大革命时代;wear costumes belonging to that～穿属于那个时代的服装;〖同〗time，era，epoch，age; 2)(地质学)纪 (unit of geologic time， longer than epoch and shorter than an era) [C]： Devonian/Jurassic～泥盆/侏罗纪;

(3)一节课 ((at school) one of the parts that the day is divided into; lesson) [C]： a teaching～of 50 minutes 50分钟的一节课;a～of English/history (an English～/a history～) 一节英语/历史课;The school day is divided into 6～s. 学校一天有六节课。

(4) 1)月经，行经 (bleeding from the body of a woman that happens each month) [C]： have a～来月经;～pains 痛经;2)月经期 (time of this)： She always feels unwell at the start of her～. 她在经期开始时总感到不适。

(5) 1)句号 (punctuation mark “.”， put at the end of a sentence) [C] (AmE) (=full stop)： A～is used with most abbreviations. 大多数缩略语都使用句号。Use a～at the end of a statement. 在陈述句末尾用句号。2)(用于一句话末尾，强调该句结束) (added to the end of a statement to indicate its completeness)： That is impossible，～. 那是不可能的，我就说这些。

(6)完全句 (常指有多个从句的复合句) (complete sentence， esp one that has several clauses) [C](gram);

(7)(天文学)自(公)转的周期 (time in which a body rotates once on its axis or a planet or satellite revolves once about its primary) [C]： the～of rotation/revolution 自/公转周期;

adj 某个特定历史时期的 (指家具、服装、建筑等)((of furniture， costumes， buildings， etc) belonging to a certain historical age or time) [作attrib]：～dress/furniture/houses/book 某个特定历史时期的服装/家具/房屋/书;～piece (infml)过时的人或物;

→͵peri′odic adj 周期(性)的;͵peri′odical n 期刊，定期出版物;adj 定期出版的;͵peri′odically adv周期(性)地;

【辨异】period与age、era 和epoch 的区别见AGE。