A second-year undergraduate student in a college or university, or a second-year student in a four-year secondary school or high school.
"As a sophomore at the university, she struggled to balance her heavy course load with part-time work."
In plain English: A sophomore is a student who is in their second year of high school or college.
"The sophomore in our dorm room is always studying late at night for his exams."
used of the second year in United States high school or college
"the sophomore class"
"his sophomore year"
The second in a series, especially, the second of an artist’s albums or the second of four years in a high school (tenth grade) or university.
"The band released their sophomore album two years after their debut, marking a significant shift in their musical style."
In plain English: Sophomore means being in your second year of high school.
"The sophomore year was surprisingly easy for me since I already knew most of my classmates."
Usage: Use "sophomore" as an adjective to describe the second item in any series, such as albums or editions of books. When referring specifically to students, it functions primarily as a noun for those in their second year of college or university.
The word sophomore comes from the obsolete English term sophom, which originally referred to a sophism or dialectical exercise in Ancient Greek. Its meaning shifted over time to describe a second-year student, likely influenced by the idea of being "wise yet foolish."