period

age, epoch, era, period, times

这些名词均含“时期、时代”之意。
age: 常指具有显著特征或以某杰出人物命名的历史时代或时期。
epoch: 正式用词，侧重指以某重大事件或巨大变化为起点的新的历史时期。
era: 书面语用词，指历史上的纪元、年代，可与epoch和age互换，侧重时期的延续性和整个历程。
period: 最普通用词，概念广泛，时间长短不限，既可指任何一个历史时期，又可指个人或自然界的一个发展阶段。
times: 侧重某一特定时期。

名词 period:

1. an amount of time
   同义词：time period, period of time
2. one of three periods of play in hockey games
3. a stage in the history of a culture having a definable place in space and time
   同义词：historic period, historical period
4. the interval taken to complete one cycle of a regularly repeating phenomenon
5. the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause--Aristotle
   同义词：menstruation, menses, menstruum, catamenia, flow
6. a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations
   同义词：point, full stop, stop, full point
7. a unit of geological time during which a system of rocks formed
   同义词：geological period
8. the end or completion of something

1. Last year was a prolific period in the composer's life.
   去年是作曲家一生中创作丰收的时期。
2. He was on his feet again after such a long period in hospital.
   住院很长一段时间他复原了。
3. It was a period of innovation.
   这是革新时期。
4. She'll be away for an indefinite period.
   她将离开一段时间，何时回来未定。
5. She has a detailed knowledge of this period.
   她对这段时期的情况了解地相当详细。
6. He was taken on for a three-month trial period before being accepted as a permanent member of staff.
   在她被接受为固定雇员之前经过了三个月的试用期。
7. Which period of history are you studying?
   你正在学哪一段历史？
8. We have three periods of chemistry a week.
   我们一星期三节化学课。

pe.ri.od

n.Abbr. per.（名词）缩写 per.
An interval of time characterized by the occurrence of a certain condition, event, or phenomenon:
期间，一段时间：以某特定条件、事件或现象的发生为特征的时间间歇：
例句：
a period of economic prosperity.
经济繁荣时期

An interval of time characterized by the prevalence of a specified culture, ideology, or technology:
时期：以某特定文化、思想或技术的盛行为特征的一段时间：
例句：
artifacts of the pre-Columbian period.
前哥伦比亚时代的手工制品

An interval regarded as a distinct evolutionary or developmental phase:
…期：时代或发展的特定时期：
例句：
Picasso`s early career is divided into his blue period and rose period.
毕加索的早期生涯被分为忧郁期和得意时期

Geology A unit of time, longer than an epoch and shorter than an era.
【地质学】 纪：比世长比代短的时间单位
Any of various arbitrary units of time, especially:
时间单位：指任何任意性时间单位，尤指：
Any of the divisions of the academic day.
一节课：学校学习日的划分
Sports Games A division of the playing time of a game.
【体育运动】 【游戏】 分场：比赛时间的划分
Physics Astronomy The time interval between two successive occurrences of a recurrent event or phases of an event; a cycle.
【物理学】 【天文学】 周期：两个连续出现或反复出现的现象或事件间的时间间隔；周期循环
An instance or occurrence of menstruation.
经期：月经的例子或出现
A point or portion of time at which something is ended; a completion or conclusion.
完结：某事结束的时间点或时间段；完成或终结
The full pause at the end of a spoken sentence.
结尾：句末的停顿
A punctuation mark ( . ) indicating a full stop, placed at the end of declarative sentences and other statements thought to be complete, and after many abbreviations.
句号：一种表示完全停顿的标点符号（。），放在句末或认为将会完成的阐述后及许多缩略式后
A sentence of several carefully balanced clauses in formal writing.
复合句：正式文体中包括若干从句的结构匀称的句子

A metrical unit of quantitative verse consisting of two or more cola.
定量测量单位：包括两个或两个以上音行的定量韵律的度量单位
An analogous unit or division of classical Greek or Latin prose.
诗文的划分：古希腊或拉丁散文中类似的分段
Music A group of two or more phrases within a composition, made up of 8 or ' measures and terminating with a cadence.
【音乐】 （音乐）分段：音乐作品中含两个或两个以上乐章的组曲，由八或十六音位组成并以和弦结尾
Mathematics
【数学】
The least interval in the range of the independent variable of a periodic function of a real variable in which all possible values of the dependent variable are assumed.
小数点：周期函数自变量变化的最小区间，其中从属变量的所有可能值都已事先确定
A group of digits separated by commas in a written number.
数字：书面数字中一个中间用逗号隔开的数字组
The number of digits that repeat in a repeating decimal. For example, !/7 = 0.4285742857 . . . has a six-digit period.
分节：循环小数中的循环位数。如!/7=0.4285742857…，有'个数的循环位
Chemistry A sequence of elements arranged in order of increasing atomic number and forming one of the horizontal rows in the periodic table.
【化学】 元素周期：一系列元素按原子序数升序排列形成的周期表中的一个横排
adj.（形容词）
Of, belonging to, or representing a certain historical age or time:
某时期的：属于、包含于或代表某特定历史时期的：
例句：
a period piece; period furniture.
时代乐章；属于某时代的家俱

来源：
Middle English periode
中古英语 periode
from Old French
源自 古法语
from Medieval Latin periodus
源自 中世纪拉丁语 periodus
from Latin perihodos [rhetorical period]
源自 拉丁语 perihodos [修辞部分]
from Greek periodos [circuit]
源自 希腊语 periodos [马戏团]
peri- [peri-]
peri- [前缀，表.周围.]
hodos [way]
hodos [方式]

<参考词汇><同义词>period,epoch,era,age,termThese nouns refer to a portion or length of time.
这些名词均指时间的一部分或长度。
Period is the most general:
Period 是最普遍的：
例句：
a short waiting period;
等了一小会儿；

例句：
one of the most difficult periods of her life;
她生命中最困难的时期；

例句：
worked for a period of ten years;
工作了十年时间；

例句：
the Romantic period in music.
音乐中的浪漫部分。

Epoch refers to a period regarded as being remarkable or memorable:
Epoch 指值得记忆的或美好的时光：
例句：
.We enter on an epoch of constitutional retrogression. (John R. Green).Anera is a period of time notable because of new or different aspects or events:
我们进入了立宪的衰退阶段 （约翰·R·格林）。Era 常指因新或不同的方面或事件而值得注意的一段时间：

例句：
.How many a man has dated a new era in his life from the reading of a book. (Henry David Thoreau).Anage is usually a period marked by a particular distinctive characteristic:
有多少人由于读一本书而开始一个新生活的历程 （亨利·戴维·梭罗）。Age 是以特别突出的特点为标志的时期：

例句：
the age of Newton;
牛顿时代；

例句：
the Iron Age.
铁器时代。

例句：
.These principles form the bright constellation which has . . . guided our steps through an age of revolution and reformation. (Thomas Jefferson). Aterm is a period of time to which limits have been set:
这些规定构成了灿烂星座…指引我们通过变革与革命时代的脚步 （汤姆斯·杰斐逊）。Term 指有限定的一段时间：

例句：
Senators are elected for a term of six years.
参议员任期六年

<注释>Perhaps more than once one may have wonderedwhy the wordperiod has the sense .punctuation mark ( . ). as well as some of its other senses having to do with time.The answer to this question lies in the senses of the Greek wordperiodos from which our word is descended. Periodos, made up of peri-, .around,. and hodos, .way,. meant such things as .going round, way round, going round in a circle, circuit,.and with regard to time .cycle or period of time..The word also meant .the period of menstruation..In rhetoric it referred to .a group of words organically related in grammar and sense..The Greek word was adopted into Latin asperihodos with only its rhetorical sense and one other sense,but in Medieval Latin it reacquired senses it had in Greek,such as .cycle,. and acquired a new sense,.a punctuation mark used at the end of a rhetorical period..Although this sense is recorded in Medieval Latin,it is not recorded in English until '09.But the wordperiod had entered Middle English from Medieval Latin and Old French, first being recorded in a work written around 425in the sense .a cycle of recurrence of a disease..
或许任何人都会不止一次的发出疑问，为什么period 有.标点符号（。）.的意思， 同时其它意思与时间有关。此问的答案来自我们的单词源自的希腊语单词periodos 的意思。 Periodos ，由意为.周围.的 peri- 和意为.方式.的 hodos 组成， 该词意味着.围绕…走，围绕…的路，转圈走，围绕，.同时也指时间，意为.一段时间或时间周期.。此词也意为.经期.。在修辞学中指.一组在语法和词意上有机相连的词。.这个希腊词作为perihodos 被拉丁文所采用， 仅带有修辞和一个其他的意思，但在中世纪拉丁语中它重新得到了它在希腊语中的意思，例如.周期.，后来又得到一个新的意思，即.用于修辞部分末尾的标点符号.。尽管此意在中世纪拉丁语中有记载，但直到'09年才在英语中有记载。而period 从中世纪拉丁文和古法语中进入中世纪英语， 并首次记载于约425年所著的作品中，意为.疾病发作的周期.