phi

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see also: PHI

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Pronunciation

• IPA: /faɪ/
• IPA: /fiː/

Noun

phi (plural phis)

1. Φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".
2. (mathematics) The golden ratio.
3. A visual illusion whereby a sequential pattern of lights produces a false sense of motion.
   • 1963, Psychology Through Experiment (George Humphrey, ‎Jaroslav Antonio Deutsch), page 90:

     […] 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.

Translations

• French: phi
• German: Phi
• Portuguese: fi
• Russian: фи
• Spanish: fi

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PHI

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Proper noun

1. (sports) Abbreviation of Philadelphia#English|Philadelphia.

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