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We found 16 dictionaries with English definitions that include the word in theory:
Click on the first link on a line below to go directly to a page where "in theory" is defined.

General (14 matching dictionaries)

1. in theory: Merriam-Webster.com [home, info]
2. in theory: Oxford Dictionaries [home, info]
3. in theory: Vocabulary.com [home, info]
4. in theory: Cambridge Advanced Learner's Dictionary [home, info]
5. in theory: Wiktionary [home, info]
6. in theory: Dictionary.com [home, info]
7. in theory: Rhymezone [home, info]
8. in theory: Free Dictionary [home, info]
9. in theory: Mnemonic Dictionary [home, info]
10. in theory: WordNet 1.7 Vocabulary Helper [home, info]
11. in theory: LookWAYup Translating Dictionary/Thesaurus [home, info]
12. in theory: Dictionary/thesaurus [home, info]

Miscellaneous (1 matching dictionary)

13. in theory: Idioms [home, info]

Slang (1 matching dictionary)

14. in theory: Urban Dictionary [home, info]

Quick definitions from WordNet (in theory) ▸ adverb:  as described in contrast to as practiced ▸ adverb:  with regard to fundamentals although not concerning details ▸ adverb:  according to the assumed facts ▸ Words similar to in theory ▸ Usage examples for in theory ▸ Words that often appear near in theory ▸ Rhymes of in theory ▸ Invented words related to in theory