period - definition in the American English Dictionary - Cambridge Dictionaries Online

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period

noun [C]  us   /ˈpɪər·i·əd/

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)
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