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We found 29 dictionaries with English definitions that include the word outer space:
Click on the first link on a line below to go directly to a page where "outer space" is defined.

General (23 matching dictionaries)

1. outer space: Merriam-Webster.com [home, info]
2. outer space: Oxford Dictionaries [home, info]
3. outer space: American Heritage Dictionary of the English Language [home, info]
4. outer space: Collins English Dictionary [home, info]
5. outer space: Vocabulary.com [home, info]
6. outer space: Macmillan Dictionary [home, info]
7. outer-space: Wordnik [home, info]
8. outer space: Cambridge Advanced Learner's Dictionary [home, info]
9. outer-space, outer space: Wiktionary [home, info]
10. outer space: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. outer space: Infoplease Dictionary [home, info]
12. outer space: Dictionary.com [home, info]
13. outer space: UltraLingua English Dictionary [home, info]
14. Outer Space (video game), Outer Space, Outer space (color), Outer space (disambiguation), Outer space (mathematics), Outer space: Wikipedia, the Free Encyclopedia [home, info]
15. outer space: Rhymezone [home, info]
16. outer space: AllWords.com Multi-Lingual Dictionary [home, info]
17. outer space: Free Dictionary [home, info]
18. outer space: Mnemonic Dictionary [home, info]
19. outer space: WordNet 1.7 Vocabulary Helper [home, info]
20. outer space: LookWAYup Translating Dictionary/Thesaurus [home, info]
21. outer space: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

22. outer space: Legal dictionary [home, info]

Computing (1 matching dictionary)

23. outer space: Encyclopedia [home, info]

Medicine (1 matching dictionary)

24. outer space: Medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

25. Outer Space: Brilliant Dream Dictionary [home, info]
26. outer space: Idioms [home, info]

Slang (1 matching dictionary)

27. Outer Space: Urban Dictionary [home, info]

(Note: See outer_spaces for more definitions.)

Quick definitions from WordNet (outer space) ▸ noun:  any location outside the Earth's atmosphere ("The astronauts walked in outer space without a tether") ▸ Also see outer_spaces ▸ Words similar to outer space ▸ Usage examples for outer space ▸ Words that often appear near outer space ▸ Rhymes of outer space ▸ Invented words related to outer space