Usually means: Mathematical ratio, aesthetic, and harmony.
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We found 29 dictionaries that define the word phi:

General (17 matching dictionaries)
  1. phi: Merriam-Webster
  2. Phi, phi: Oxford Learner's Dictionaries
  3. phi: American Heritage Dictionary of the English Language
  4. phi: Collins English Dictionary
  5. phi: Vocabulary.com
  6. Phi, phi, phi: Wordnik
  7. phi: Wiktionary
  8. phi: Webster's New World College Dictionary, 4th Ed.
  9. PHI: Dictionary.com
  10. PHI (disambiguation), PHI, Phi (KinKi Kids album), Phi (disambiguation), Phi (letter), Phi: Wikipedia, the Free Encyclopedia
  11. phi: Rhymezone
  12. PHI: Stammtisch Beau Fleuve Acronyms
  13. phi: FreeDictionary.org
  14. phi: Mnemonic Dictionary
  15. phi: TheFreeDictionary.com
  16. phi: The Wordsmyth English Dictionary-Thesaurus
  17. phi: Infoplease Dictionary

Art (1 matching dictionary)
  1. Glossary of Stamp Collecting Terms (No longer online)

Computing (1 matching dictionary)
  1. Phi (Golden Ratio), Phi (number): Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. PHI (disambiguation), phi: Medical dictionary

Miscellaneous (4 matching dictionaries)
  1. Encyclopedia of Graphic Symbols (No longer online)
  2. PHI: Acronym Finder
  3. PHI: Three Letter Words with definitions
  4. AbbreviationZ (No longer online)

Religion (1 matching dictionary)
  1. Irivng Hexham's Concise Dictionary of Religion (No longer online)

Science (1 matching dictionary)
  1. PHI: Cytokines & Cells Online Pathfinder Encyclopaedia

Slang (1 matching dictionary)
  1. Phi: Urban Dictionary

Tech (1 matching dictionary)
  1. Rane Professional Audio Reference (No longer online)

(Note: See phis as well.)

Definitions from Wiktionary (PHI)

noun:  Φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".
noun:  (mathematics) The golden ratio.
noun:  A visual illusion whereby a sequential pattern of lights produces a false sense of motion.
noun:  (sports) Abbreviation of Philadelphia. [The largest city in Pennsylvania, United States, and the county seat of coterminous Philadelphia County; the former capital of the United States.]
noun:  (medicine, law) Initialism of protected health information.

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