how many semester in one year of a usa university?
Normally two full semesters, with an additional shorter “summer session.”
There are some schools, however, that run under a 3 trimester system. They’re far less common, but they do exist.
Two semesters (fall & spring).
Quarter system schools will have 3 quarters in a school year (fall, winter & spring).
Each semester lasts 15 weeks. Fall and spring.