fourth-grade
UK: ˌfɔːθ ˈɡreɪd | US: ˌfɔːrθ ˈɡreɪd
adj. relating to the fourth year of primary education in the US school system
n. (hyphenated) a student in the fourth year of primary education
The term combines "fourth," derived from Old English "fēowertha" (related to "four"), with "grade," from Latin "gradus" (step/degree). In US education, "grade" denotes yearly divisions, and "fourth-grade" specifically marks the fourth year of elementary school. The hyphenation reflects its function as a compound adjective or noun.
She teaches a fourth-grade class at Maplewood Elementary.
My son is excited to start fourth-grade this fall.
The fourth-grade curriculum includes state history.
They won the fourth-grade science fair with their volcano project.
Fourth-grade reading levels vary widely among students.