phi

  1. Noun.  The twenty-first letter of the Classical and Modern Greek, the twenty-second letter of Old and Ancient.
  2. Noun.  A visual illusion caused by lights turning on and off in a sequential pattern that implies motion.
  3. Noun.  (mathematics) The symbol for the golden ratio.

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This entry was last updated on RefTopia from its source on 3/20/2012.