A mutual relationship or connection between two or more things where they influence or affect each other.
From corelate + -tion (Latin suffix forming nouns), from co- + relation. Became a technical term in statistics and mathematics.
The famous phrase 'correlation is not causation' exists because our brains naturally assume that when two things happen together, one must have caused the other—but corelation is just a pattern, not proof of cause.
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