phi
/faɪ/
phi noun: φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".
Noun (1)
phi (plural phis)
- Φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".
- The golden ratio.
- A visual illusion whereby a sequential pattern of lights produces a false sense of motion.
- […] tolerance (Frenkel-Brunswik 1949) for it showed that those persons with the strongest defences against internal conflict, i.e. obsessionals and conversion hysterics, were those least able to perceive the reality-conflicting phenomenon of phi.1963, Psychology Through Experiment (George Humphrey, Jaroslav Antonio Deutsch), page 90
- The illusion of movement in a highway construction sign is an instance of the phi phenomenon, which is also at work in motion pictures and television.2007, Wayne Weiten, Psychology: Themes and Variations: Themes And Variations, page 138
Proper noun capitalized: PHI
PHI
- Abbreviation of Philadelphia.
Noun (2) capitalized: PHI
PHI (uncountable)
- Initialism of protected health information.
phi meaning in Hindi, Tamil, Bengali and Telugu
phi in Hindi
- फ़ाई
phi in Tamil
- ஃபை
phi in Bengali
- ফাই
More languagesFewer languages
- phi in Malayalam
- ഫൈ, ഫി
- phi in Kannada
- ಫೈ, ಫಿ
- phi in Odia
- ଫାଇ
- phi in Arabic
- فَاي fay
- phi in Malay
- fi
- phi in Persian
- فی fi
Forms of phi
| plural | phis |
|---|
Origin of phi
From Late Latin phi, from Ancient Greek φεῖ (pheî).
Words formed from phi
Phrases with phi
Words that rhyme with phi
Questions about phi
- What does phi mean?
- Phi means φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".
- What is phi in Hindi?
- Phi in Hindi is फ़ाई. See Phi meaning in Hindi.
- What part of speech is phi?
- Phi can be a noun or a proper noun.
- How do you pronounce phi?
- Phi is pronounced /faɪ/.
- What is the plural of phi?
- The plural of phi is phis.
Words near phi in the dictionary
Source and license
Adapted from Wiktionary: phi (page history and authors); PHI (page history and authors); phi (Hindi, IndicTrans2 machine translation) (model and license); phi (Tamil, IndicTrans2 machine translation) (model and license); phi (Bengali, IndicTrans2 machine translation) (model and license); phi (Telugu, IndicTrans2 machine translation) (model and license); phi (Malayalam, IndicTrans2 machine translation) (model and license); phi (Kannada, IndicTrans2 machine translation) (model and license); phi (Odia, IndicTrans2 machine translation) (model and license). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.
Last updated:
Pronunciation audio from Wikimedia Commons, each file under its own free license: En-us-phi.ogg.
Cite this entry: “phi.” Word.ws, https://word.ws/phi. Based on Wiktionary, CC BY-SA 4.0.