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semester

se·mes·ter [ sə méstər ] (plural se·mes·ters)


noun 
Definition:
 
period when students are in school: especially in the United States, either of two periods of 15 to 18 weeks into which the academic year is divided in some universities and colleges

[Early 19th century. Via German< Latin semestris "of six months" < sex "six" + mensis "month"]

se·mes·tral adjective
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