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upperclassman

[uhp-er-klas-muh n, -klahs-]
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noun, plural up·per·class·men.
  1. a junior or senior in a secondary school or college.

Origin of upperclassman

An Americanism dating back to 1870–75; upper1 + class + -man
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018