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Meaning of "period" in Essential American English Dictionary

period

noun   /ˈpɪər·i·əd/
B1 a length of time: a 24-hour period a period of four months
B1 in a school, one of the parts of the day when a subject is taught: We have six periods of science a week.
B1 the punctuation mark (.) that is put at the end of a sentence, or at the end of a word that has been shortened
(Definition of period from the Websters Essential Mini Dictionary © Cambridge University Press)
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