We found 8 dictionaries that define the word upperclassmen:

General (7 matching dictionaries)

1. upperclassmen: Merriam-Webster
2. upperclassmen: Oxford Learner's Dictionaries
3. upperclassmen: Collins English Dictionary
4. Upperclassmen, upperclassmen: Wordnik
5. upperclassmen: Wiktionary
6. upperclassmen: Dictionary.com
7. upperclassmen: TheFreeDictionary.com

Slang (1 matching dictionary)

8. Upperclassmen: Urban Dictionary

(Note: See upperclassman as well.)

Definitions from Wiktionary (upperclassman) ▸ noun:  (US) A junior or senior student in a school or college. ▸ Also see upperclassman Opposite: underclassmen, freshmen, sophomores, juniors ▸ Words similar to upperclassmen ▸ Usage examples for upperclassmen ▸ Idioms related to upperclassmen ▸ Wikipedia articles (New!) ▸ Popular adjectives describing upperclassmen ▸ Words that often appear near upperclassmen ▸ Rhymes of upperclassmen ▸ Invented words related to upperclassmen