/ ˈsɒfəmɔː(r); NAmE ˈsɑːf-/ noun ( US )
1.
a student in the second year of a course of study at a college or university
2.
a high school student in the 10th grade
—compare freshman , junior , senior
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WORD ORIGIN
mid 17th cent.: perhaps from earlier sophumer , from sophum , sophom (obsolete variants of sophism ) + -er .