das Studienjahr
academic year
The period of an academic year at a college or university, usually divided into two semesters.
Das neue Studienjahr beginnt offiziell am ersten Oktober.
The new academic year officially begins on October first.

academic year
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academic year
The period of an academic year at a college or university, usually divided into two semesters.
Das neue Studienjahr beginnt offiziell am ersten Oktober.
The new academic year officially begins on October first.

'Studienjahr' is a compound of 'Studium' (studies, in the form 'Studien-') and 'Jahr' (year). So it literally refers to a 'year of study' at a university or college.
Für mein Auslandssemester plane ich das nächste Studienjahr ein.
I am planning my semester abroad for the next academic year.
Common verbs used with 'Studienjahr' (academic year) are 'beginnen' (to begin) and 'enden' (to end). It is also often combined with adjectives such as 'akademisch' (academic), 'laufend' (current), or 'kommend' (upcoming).
Das laufende Studienjahr ist fast vorbei.
The current academic year is almost over.
This noun is often used with temporal prepositions to define a period of time. Typical phrases are 'im Studienjahr' (in the academic year), 'während des Studienjahres' (during the academic year), or 'zu Beginn des Studienjahres' (at the beginning of the academic year).
Während des gesamten Studienjahres müssen die Studierenden mehrere Prüfungen ablegen.
Throughout the entire academic year, the students have to take several exams.
semester
'Semester' and 'Studienjahr' both belong to studying at a college or university. The difference is the length. A 'Semester' is half an academic year. A 'Studienjahr' usually includes two semesters. Learners may confuse the words because both organize time during studies. If you are talking about one individual period with courses and exams, 'Semester' usually fits. If you mean the whole academic year, 'Studienjahr' is more precise.

Am Morgen plant ich schon das nächste Studienjahr und wähle meine Kurse aus.
In the morning, I am already planning the next academic year and choosing my courses.
Das Semester endet im Februar mit zwei Prüfungen.
The semester ends in February with two exams.