A semester stands for a measured stretch of effort with a clear start and finish. Dream books read it as a cycle of learning and the sense of time passing in stages.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.