Webster's English Dictionary

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correlation

cor.re.la.tion \.ko.r-*-'la--sh*n, .ka:r-\ \-shn*l, -sh*n-*l\ n [ML 
   correlations-, correlatio, fr. L com- + relation-,]relatio relation 1: the 
   act of correlating : the state of being correlated; specif :: a relation of 
   invariable accompaniment 2: reciprocal relation in the occurrence of 
   different structure, characteri stics, or processes in organisms - 
   cor.re.la.tion.al aj