"on a semester" is a correct and usable phrase in written English.
It typically refers to being enrolled in or participating in a specific semester of an academic program or course. Example: "I am currently on a semester studying abroad in Spain."
The one we present here appeared on a semester exam.
"High schools in New York City are organized on a semester basis, so for one semester I taught five periods and did lunch duty.
At Berkeley, which is on a semester system, the same calculations put the increase at $5.22 per day.
Similarly, undergrads prone to seasickness showed more body sway on dry land before embarking on a semester at sea.
I visited Grete and Jack when our son was on a semester abroad programme in Sweden in 2007.
Classes are usually held once a week on a semester basis, and the hand tools class is specifically recommended.
Course and program details still are being developed, but Marrs said he envisions something similar to what the university is doing in Washington, D.C., where undergraduates can take on internships for a semester and enroll in classes that are anchored by a professor but taught, for example, by the lead budget director for the U.S. Senate.
The fraternity is put on probation for a semester by the university and nothing else.
He was sent to an alcohol education class in sophomore year after being caught driving under the influence, and was put on probation for a semester.
Formally founded in 2005, Chegg focuses primarily on renting textbooks for a semester at a time, with 180,000 titles in its catalog.
Her publications were soon noticed in the United States, and by the early 1970's, she had begun teaching at Columbia University, where to this day she remains a visiting professor, returning to New York for a semester, on average, every three years.
