An educational level or stage between primary school and secondary school.
A school which crosses the traditional divide between primary school and secondary school.
A second-year undergraduate student in a college or university, or a second-year student in a four-year secondary school or high school.
A three-year-old horse.
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.
Sophomoric.