Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “period”

See all translations

period

noun [C]  /ˈpɪər·i·əd/ us  

period noun [C] (TIME)

a length of time: The study will be carried out over a six-month period. A period in the life of a person or in history is a particular time during that life or history: The period after World War II was marked by rapid economic growth. A period is a division of time in an event of fixed length, such as a day at school or a game: There was no scoring in the second period. physics A period is the time it takes for one complete repetition of a pattern that repeats. A second is used as the standard unit in most areas of science. Period costume/dress/furniture is the clothing or furniture of a particular time in history: At the Revolutionary War theme park, everyone was wearing period costumes.

period noun [C] (MARK)

a mark (.) used in writing to show where the end of a sentence is, or to show that the letters before it are an abbreviation (= short word form) infml You can say period at the end of a statement as a way of adding emphasis: There will be no more shouting, period!

period noun [C] (BLEEDING)

( also menstrual period,  /ˈmen·strəlˌpɪr·i·əd, -strə·wəl-/) the bleeding from a woman’s uterus that happens approximately every four weeks when she is not pregnant

period noun [C] (REPEATED EVENT)

period noun [C] (ROW)

chemistry any of the rows in the periodic table of chemical elements
(Definition of period from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of period?
Add Cambridge dictionaries to your browser to your website

More American English definitions for “period”

Definitions of “period” in other dictionaries

Word of the Day

pot luck

anything that is available or is found by chance, rather than something chosen, planned, or prepared

Word of the Day

Think long and hard; the language of decisions

by Liz Walter,
January 28, 2015
One of the best ways (perhaps the best way) to improve your English is to learn how words go together in phrases, idioms, or other patterns such as verb/noun or adjective/noun pairs (often called ‘collocations’). This blog looks at some useful phrases and collocations connected with the subject of decisions, something we

Read More 

micro pig noun

January 26, 2015
an extremely small pig, bred to be a pet Micro pigs have become popular pets recently, with famous owners including Victoria Beckham, Paris Hilton and Olympic diver, Tom Daley.

Read More