To have a mutual relationship or connection where two things affect or influence each other.
From co- (together) + relate, from Latin relatus (brought back), from referre (to carry back). The term originated in statistical and scientific contexts.
Correlation is one of science's trickiest concepts because when two things corelate, it doesn't mean one caused the other—ice cream sales and drowning deaths corelate, but ice cream doesn't cause drowning!
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