Etymology
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semester (n.)

1827, "period or term of six months," specifically, a half-year course in a German or other Continental university, from German Semester "half-year course in a university," from Latin semestris, in cursus semestris "course of six months," from semestris, semenstris "of six months, lasting six months, half-yearly, semi-annual," from assimilated form of sex "six" (see six) + mensis "month" (see moon (n.)). The word, and the idea, were picked up in the U.S., where the German higher education system served as a model. Related: Semestral; semestrial (1701).

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Definitions of semester

semester (n.)
one of two divisions of an academic year;
semester (n.)
half a year; a period of 6 months;
From wordnet.princeton.edu