Meaning of autocorrelation

au•to•cor•re•la•tion

Pronunciation: (ô"tō-kôr"u-lā'shun, -kor"-), [key]
— n. Statistics.
  1. the correlation of an ordered series of observations with the same series displaced by the same number of terms.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.