A semester was a time period during the study at a university. Tom Paris studied two semesters biochemistry at Starfleet Academy. (VOY: "Parallax") During his second semester he chose the Starfleet base in Marseille and spent most of his time at Chez Sandríne. (VOY: "The Cloud") The Academy Extension Course was a semester-long course at Starfleet Academy. (VOY: "Non Sequitur") Chakotay dodged asteroids for a semester during his time at Starfleet Academy. (VOY: "Future's End") A semester of Interspecies Protocol was a necessity at Starfleet Academy. (VOY: "The Disease")