Wiktionary
n. (context US English) A break between semesters
Wikipedia
Intersession is a short break or mini-term between the traditional, standard academic terms. An intersession may be a period of a few weeks between semesters or quarters during which students can take short, accelerated classes or complete other academic work.
Usage examples of "intersession".
By intersession she meant that the spring semester was over and the summer sessions had not yet started.
Many of the staff had already left for vacation during intersession, now that new scheduling had freed everyone from doing mini-courses between semesters.
I sit alone over there these nights hoping some impoverished youngster, unable to afford a trip home at intersession, will be moved by an uncontrollable itch for travel to come to my lab and earn his fare.
He signed on for an intersession internship at the SDHPD, and ended up here.
Soon thereafter, he begins f2f work with that clinician, who also happens to use intersession email and VR in his EMDR treatment.