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We found 26 dictionaries with English definitions that include the word look up:
Click on the first link on a line below to go directly to a page where "look up" is defined.

General (21 matching dictionaries)

1. look-up, look up: Merriam-Webster.com [home, info]
2. look up: Oxford Learner's Dictionaries [home, info]
3. look-up, look-up, look up: Collins English Dictionary [home, info]
4. look up: Vocabulary.com [home, info]
5. look up: Macmillan Dictionary [home, info]
6. Look-Up, Look-up, look-up: Wordnik [home, info]
7. look up: Cambridge Advanced Learner's Dictionary [home, info]
8. look-up, look up: Wiktionary [home, info]
9. look-up, look up: Dictionary.com [home, info]
10. look up: UltraLingua English Dictionary [home, info]
11. Look Up (Bob Neuwirth album), Look Up (Mod Sun album), Look Up (song): Wikipedia, the Free Encyclopedia [home, info]
12. look up: Phrasal Verb Page [home, info]
13. look up: Free Dictionary [home, info]
14. look up: Mnemonic Dictionary [home, info]
15. look up: WordNet 1.7 Vocabulary Helper [home, info]
16. look up: LookWAYup Translating Dictionary/Thesaurus [home, info]
17. look-up, look up: Dictionary/thesaurus [home, info]
18. Look Up, Look-up: Wikipedia, the Free Encyclopedia [home, info]
19. look up: Rhymezone [home, info]

Business (2 matching dictionaries)

20. look up: Legal dictionary [home, info]
21. look up: Financial dictionary [home, info]

Computing (1 matching dictionary)

22. look-up, look up: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

23. look up: Idioms [home, info]

Slang (1 matching dictionary)

24. Look up, Look up: Urban Dictionary [home, info]

(Note: See look_ups for more definitions.)

Quick definitions from WordNet (look up) ▸ verb:  seek information from ▸ Also see look_ups ▸ Words similar to look up ▸ Usage examples for look up ▸ Idioms related to look up (New!) ▸ Words that often appear near look up ▸ Rhymes of look up ▸ Invented words related to look up