autocorrelation
Concise Oxford English Dictionary © 2008 Oxford University Press:
autocorrelation/ɔːtə(ʊ)kɒrɪˈleɪʃ(ə)n/
▶noun Mathematics & Statistics correlation between the elements of a series and others from the same series separated from them by a given interval.
'autocorrelation' also found in these Oxford entries:

