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We found 40 dictionaries with English definitions that include the word breakthrough:
Click on the first link on a line below to go directly to a page where "breakthrough" is defined.

General (27 matching dictionaries)

1. breakthrough: Merriam-Webster.com [home, info]
2. breakthrough: Oxford Dictionaries [home, info]
3. breakthrough: American Heritage Dictionary of the English Language [home, info]
4. breakthrough: Collins English Dictionary [home, info]
5. breakthrough: Vocabulary.com [home, info]
6. breakthrough: Macmillan Dictionary [home, info]
7. Breakthrough, breakthrough: Wordnik [home, info]
8. breakthrough: Cambridge Advanced Learner's Dictionary [home, info]
9. breakthrough: Wiktionary [home, info]
10. breakthrough: Webster's New World College Dictionary, 4th Ed. [home, info]
11. breakthrough: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. breakthrough: Infoplease Dictionary [home, info]
13. breakthrough: Dictionary.com [home, info]
14. breakthrough: UltraLingua English Dictionary [home, info]
15. breakthrough: Cambridge Dictionary of American English [home, info]
16. Breakthrough (Aya Hirano song), Breakthrough (Colbie Caillat album), Breakthrough (Dutch political history), Breakthrough (Lemonade Mouth song), Breakthrough (TV series), Breakthrough (The Gaslamp Killer album), Breakthrough (Twice song), Breakthrough (board game), Breakthrough (human rights), Breakthrough (military), Breakthrough, The Breakthrough: Wikipedia, the Free Encyclopedia [home, info]
17. breakthrough: Cambridge International Dictionary of Phrasal Verbs [home, info]
18. breakthrough: Rhymezone [home, info]
19. breakthrough: AllWords.com Multi-Lingual Dictionary [home, info]
20. breakthrough: Free Dictionary [home, info]
21. breakthrough: Mnemonic Dictionary [home, info]
22. breakthrough: WordNet 1.7 Vocabulary Helper [home, info]
23. breakthrough: LookWAYup Translating Dictionary/Thesaurus [home, info]
24. breakthrough: Dictionary/thesaurus [home, info]
25. breakthrough: Wikimedia Commons US English Pronunciations [home, info]

Business (3 matching dictionaries)

26. Breakthrough: MoneyGlossary.com [home, info]
27. breakthrough: Financial dictionary [home, info]
28. breakthrough: BusinessDictionary.com [home, info]

Computing (1 matching dictionary)

29. breakthrough: Encyclopedia [home, info]

Medicine (3 matching dictionaries)

30. breakthrough: online medical dictionary [home, info]
31. breakthrough: Glossary of HIV/AIDS Related Terms [home, info]
32. breakthrough: Medical dictionary [home, info]

Slang (1 matching dictionary)

33. Breakthrough: Urban Dictionary [home, info]

Sports (1 matching dictionary)

34. Breakthrough: Chess Dictionary [home, info]

Tech (4 matching dictionaries)

35. Breakthrough: Glossary of Coal Mining Terms [home, info]
36. BREAKTHROUGH: Lake and Water Word Glossary [home, info]
37. breakthrough: Schlumberger Oilfield Glossary [home, info]
38. BREAKTHROUGH: Power Engineering [home, info]

(Note: See breakthroughs for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (breakthrough) ▸ noun:  making an important discovery ▸ noun:  a penetration of a barrier such as an enemy's defense ▸ noun:  a productive insight ▸ Also see breakthroughs ▸ Words similar to breakthrough ▸ Usage examples for breakthrough ▸ Popular adjectives describing breakthrough ▸ Words that often appear near breakthrough ▸ Rhymes of breakthrough ▸ Invented words related to breakthrough