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We found 32 dictionaries with English definitions that include the word upstart:
Click on the first link on a line below to go directly to a page where "upstart" is defined.

General (29 matching dictionaries)

1. upstart: Merriam-Webster.com [home, info]
2. upstart: Oxford Dictionaries [home, info]
3. upstart: American Heritage Dictionary of the English Language [home, info]
4. upstart: Collins English Dictionary [home, info]
5. upstart: Vocabulary.com [home, info]
6. upstart, upstart: Macmillan Dictionary [home, info]
7. Upstart, upstart: Wordnik [home, info]
8. upstart: Cambridge Advanced Learner's Dictionary [home, info]
9. upstart: Wiktionary [home, info]
10. upstart: Webster's New World College Dictionary, 4th Ed. [home, info]
11. upstart: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. upstart: Infoplease Dictionary [home, info]
13. upstart: Dictionary.com [home, info]
14. upstart (n.): Online Etymology Dictionary [home, info]
15. upstart: UltraLingua English Dictionary [home, info]
16. upstart: Cambridge Dictionary of American English [home, info]
17. Upstart (company), Upstart (software), Upstart: Wikipedia, the Free Encyclopedia [home, info]
18. Upstart: Online Plain Text English Dictionary [home, info]
19. upstart: Webster's Revised Unabridged, 1913 Edition [home, info]
20. upstart: Rhymezone [home, info]
21. upstart: AllWords.com Multi-Lingual Dictionary [home, info]
22. upstart: Webster's 1828 Dictionary [home, info]
23. upstart: Free Dictionary [home, info]
24. upstart: Mnemonic Dictionary [home, info]
25. upstart: WordNet 1.7 Vocabulary Helper [home, info]
26. upstart: LookWAYup Translating Dictionary/Thesaurus [home, info]
27. upstart: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

28. upstart: Encyclopedia [home, info]

Medicine (1 matching dictionary)

29. upstart: online medical dictionary [home, info]

Slang (1 matching dictionary)

30. upstart: Urban Dictionary [home, info]

(Note: See upstarts for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (upstart) ▸ noun:  a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class ▸ noun:  an arrogant or presumptuous person ▸ noun:  a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an errect position by arching the back and swinging the legs out and down while forcing the chest upright ▸ Also see upstarts ▸ Word origin ▸ Words similar to upstart ▸ Usage examples for upstart ▸ Popular adjectives describing upstart ▸ Words that often appear near upstart ▸ Rhymes of upstart ▸ Invented words related to upstart