noun
regular course; regular program
Refers to the main, full-time course of study at a school, as opposed to part-time, evening, or preparatory courses.
彼は大学の本科で経済学を専攻している。
He is majoring in economics in the university's regular program.
noun
this course; this department
Used to refer to the speaker's own course or department, often in formal or institutional contexts.
本科の学生は、この書類を提出してください。
Students of this department, please submit this document.