Meaning of phi-phenomenon

phi-phe•nom•e•non

Pronunciation: (fī'fi-nom"u-non", -nun), [key]
— pl. -na
  1. motion perceived by a subject, esp. the illusion of movement produced when stationary stimuli, as pictures or lights, are presented in rapid succession and are sometimes in slightly different positions.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.