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We found 15 dictionaries with English definitions that include the word grownup:
Click on the first link on a line below to go directly to a page where "grownup" is defined.

General (14 matching dictionaries)

1. grownup: American Heritage Dictionary of the English Language [home, info]
2. grownup: Vocabulary.com [home, info]
3. Grownup, grownup: Wordnik [home, info]
4. grownup: Wiktionary [home, info]
5. grownup: The Wordsmyth English Dictionary-Thesaurus [home, info]
6. grownup: Dictionary.com [home, info]
7. grownup: Cambridge Dictionary of American English [home, info]
8. Grownup (disambiguation), Grownup: Wikipedia, the Free Encyclopedia [home, info]
9. grownup: Rhymezone [home, info]
10. grownup: Free Dictionary [home, info]
11. grownup: Mnemonic Dictionary [home, info]
12. grownup: WordNet 1.7 Vocabulary Helper [home, info]
13. grownup: LookWAYup Translating Dictionary/Thesaurus [home, info]
14. grownup: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

15. grownup: Encyclopedia [home, info]

(Note: See grownups for more definitions.)

Quick definitions from WordNet (grownup) ▸ noun:  a fully developed person from maturity onward ▸ adjective:  (of animals) fully developed ▸ Also see grownups ▸ Words similar to grownup ▸ Usage examples for grownup ▸ Popular adjectives describing grownup ▸ Popular nouns described by grownup ▸ Words that often appear near grownup ▸ Rhymes of grownup ▸ Invented words related to grownup