Temperature correlation refers to the relationship or connection between two or more temperatures. It describes how changes in one temperature may affect or relate to changes in another temperature. Full definition
[Jeff Weeks, a mathematician who is working with Spergel to analyze WMAP's data, says, «The large - scale temperature correlations across the sky are much less than one would expect in an infinite universe but exactly what one would expect in a finite one.»] (discovermagazine.com)