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We found 75 dictionaries with English definitions that include the word pi:
Click on the first link on a line below to go directly to a page where "pi" is defined.

General (35 matching dictionaries)

1. PI, pi: Merriam-Webster.com [home, info]
2. PI, Pi, pi, pi: Oxford Learner's Dictionaries [home, info]
3. PI, pi, pi: American Heritage Dictionary of the English Language [home, info]
4. pi: Collins English Dictionary [home, info]
5. PI, pi: Vocabulary.com [home, info]
6. pi: Macmillan Dictionary [home, info]
7. PI, Pi, Pi, pi, pi, pI: Wordnik [home, info]
8. pi: Cambridge Advanced Learner's Dictionary [home, info]
9. P.I, PI, P'i, Pi, pi: Wiktionary [home, info]
10. pi: Webster's New World College Dictionary, 4th Ed. [home, info]
11. P.I, pi: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. pi: Infoplease Dictionary [home, info]
13. p.i, pi, pi: Dictionary.com [home, info]
14. pi: Online Etymology Dictionary [home, info]
15. pi: UltraLingua English Dictionary [home, info]
16. P.I, P.I. (TV series), PI (disambiguation), PI, P.i, Pi (.hack), Pi (art project), Pi (disambiguation), Pi (film), Pi (instrument), Pi (kana), Pi (letter), Pi (magazine), Pi (mathematical constant), Pi (mathematics), Pi (movie), Pi (number), Pi (soundtrack), Pi (state), Pi (surname), Pi: Wikipedia, the Free Encyclopedia [home, info]
17. Pi: Online Plain Text English Dictionary [home, info]
18. pi: Webster's Revised Unabridged, 1913 Edition [home, info]
19. pi: Rhymezone [home, info]
20. Pi: AllWords.com Multi-Lingual Dictionary [home, info]
21. PI, PI: Stammtisch Beau Fleuve Acronyms [home, info]
22. pi: All About Homonyms [home, info]
23. pi: Hutchinson's Dictionary of Difficult Words [home, info]
24. Pi: Encarta® Online Encyclopedia, North American Edition [home, info]
25. pi: Free Dictionary [home, info]
26. pi: Hutchinson Dictionaries [home, info]
27. pi: Mnemonic Dictionary [home, info]
28. pi: WordNet 1.7 Vocabulary Helper [home, info]
29. PI, pi: LookWAYup Translating Dictionary/Thesaurus [home, info]
30. PI: Dictionary/thesaurus [home, info]
31. pi: American Heritage Dictionary of the English Language [home, info]
32. pi: Infoplease Dictionary [home, info]
33. pi: AllWords.com Multi-Lingual Dictionary [home, info]

Art (5 matching dictionaries)

34. pi: ArtLex Lexicon of Visual Art Terminology [home, info]
35. pi: Cook's Thesaurus [home, info]
36. pi-: A Cross Reference of Latin and Greek Elements [home, info]
37. PI, Pi: Glossary of Stamp Collecting Terms [home, info]
38. Pi: Virginia Tech Multimedia Music Dictionary [home, info]

Business (2 matching dictionaries)

39. PI, Pi: Construction Term Glossary [home, info]
40. P.I: Glossary of Trade and Shipping Terms [home, info]

Computing (5 matching dictionaries)

41. PI: Free On-line Dictionary of Computing [home, info]
42. PI: BABEL: Computer Oriented Abbreviations and Acronyms [home, info]
43. PI: Computer Telephony & Electronics Dictionary and Glossary [home, info]
44. PI: I T Glossary [home, info]
45. Pi (definition), Pi (mathematical constant), Pi (number), pi: Encyclopedia [home, info]

Medicine (8 matching dictionaries)

46. PI: MedTerms.com Medical Dictionary [home, info]
47. PI: AIDSinfo Glossary [home, info]
48. PI, pi: online medical dictionary [home, info]
49. PI: AIDS Medical Glossary and Drug Chart [home, info]
50. PI: Glossary of HIV/AIDS Related Terms [home, info]
51. P.I, PI, Pi (definition), Pi (mathematical constant), Pi (number): Medical dictionary [home, info]
52. PI: PERFUSION TECHNOLOGY, OPEN HEART SURGERY AND CARDIOLOGY [home, info]
53. PI: Drug Medical Dictionary [home, info]

Miscellaneous (3 matching dictionaries)

54. PI, PI, PI: Terminology and Descriptions of Geneaological Words [home, info]
55. pi: Acronym Finder [home, info]
56. PI: AbbreviationZ [home, info]

Science (7 matching dictionaries)

57. Pi: Eric Weisstein's World of Mathematics [home, info]
58. pi: Imagine the Universe! Dictionary [home, info]
59. pi: MATH SPOKEN HERE! [home, info]
60. PI: Extragalactic Astronomy [home, info]
61. pi, pi(x): PlanetMath Encyclopedia [home, info]
62. PI: A Dictionary of Quaternary Acronyms and Abbreviations [home, info]
63. pi: How Many? A Dictionary of Units of Measurement [home, info]

Slang (1 matching dictionary)

64. P.I, P.I, PI, pi: Urban Dictionary [home, info]

Tech (9 matching dictionaries)

65. pi: Webster's New World Telecom Dictionary [home, info]
66. PI: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING [home, info]
67. pi: High-Energy Astrophysics [home, info]
68. pi: Electronics [home, info]
69. PI: Basics of Space Flight Glossary [home, info]
70. PI: DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations [home, info]
71. PI: Printed Circuit Design and Manufacturing Glossary [home, info]
72. PI: Schlumberger Oilfield Glossary [home, info]
73. pi: Rane Professional Audio Reference [home, info]

(Note: See pis for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (pi) ▸ noun:  the 16th letter of the Greek alphabet ▸ noun:  the ratio of the circumference to the diameter of a circle ▸ noun:  an antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs ▸ noun:  the scientist in charge of an experiment or research project ▸ noun:  someone who can be employed as a detective to collect information ▸ name:  A surname (very rare: popularity rank in the U.S.: #69127) ▸ Also see pis ▸ Word origin ▸ Words similar to pi ▸ Usage examples for pi ▸ Idioms related to pi (New!) ▸ Popular adjectives describing pi ▸ Words that often appear near pi ▸ Rhymes of pi ▸ Invented words related to pi