A university/college student; someone enrolled at a university.
弟は来年大学生になる予定だ。
My younger brother is scheduled to become a university student next year.
大学生のうちにできるだけ多くの経験をしたい。
I want to gain as much experience as possible while I'm a university student.
彼女は大学生でアルバイトをしながら勉強している。
She is a university student who studies while working a part-time job.