A "semester break" is a period of time when students have time off from school in between two semesters or academic terms. It's like a vacation from studying and attending classes. Full definition
Even a few weeks completed during semester break gives you an advantage over fellow graduates who have not taken the initiative to gain relevant experience. (hays.co.uk)
Every summer and Christmas semester break they spend remodeling the house, restoring the 5 acre farm and exploring the local sights and culture. (goodreads.com)